Free Anatomy and Physiology practice for Anatomy and Physiology Version 1 (HESI A2). Answer 25 nursing exam-style questions with rationales, exam mode, and prog
Which hormone stimulates milk production in the breasts during lactation?
Select the best answer.
Explanation:
Prolactin is the hormone responsible for stimulating milk production in the breasts during lactation. It is produced by the pituitary gland and plays a crucial role in the initiation and maintenance of lactation. While norepinephrine, antidiuretic hormone, and oxytocin have roles in various physiological processes, they do not directly stimulate milk production. Therefore, the correct answer is prolactin.
What are chemical messengers that control growth, differentiation, and the metabolism of specific target cells called?
Select the best answer.
Explanation:
Hormones are signaling molecules produced by glands that travel through the bloodstream to target cells, exerting control over processes like growth, differentiation, and metabolism. Neurons are nerve cells responsible for transmitting electrical impulses. Glands are structures that secrete substances like hormones. Second messengers are molecules involved in intracellular signal transduction pathways, amplifying and transmitting signals from the cell membrane to the nucleus.
How much air does an adult inhale in an average breath?
Select the best answer.
Explanation:
An adult typically inhales around 500 mL of air in an average breath. This volume is known as tidal volume, representing the amount of air inspired or expired during normal breathing. Tidal volume plays a crucial role in efficient gas exchange in the lungs and maintaining adequate oxygen levels in the body. It is essential for proper respiratory function and ensuring the body receives the necessary oxygen for cellular respiration and overall metabolism.
Which type of cell secretes antibodies?
Select the best answer.
Explanation:
Plasma cells are a type of white blood cell specialized in producing and secreting antibodies. Antibodies, also known as immunoglobulins, are vital components of the immune system that help recognize and neutralize pathogens. When the body encounters an antigen, plasma cells are activated to produce and secrete antibodies specific to that antigen. These antibodies bind to the pathogen, marking it for destruction by other immune cells. Therefore, plasma cells are the correct answer as they are specifically designed to produce and secrete antibodies to fight infections.
What force primarily drives filtration in the kidneys?
Select the best answer.
Explanation:
Filtration in the kidneys is primarily driven by blood pressure. The glomerulus filters blood under pressure, allowing small molecules and fluids to pass through into the renal tubules while retaining larger molecules like proteins. Osmosis, smooth muscle contraction, and peristalsis do play roles in kidney function, but blood pressure is the main force responsible for the initial filtration process.
Which of the following hormones decreases the concentration of blood glucose?
Select the best answer.
Explanation:
Insulin is the hormone responsible for decreasing the concentration of blood glucose levels by promoting the uptake and storage of glucose in cells. When blood glucose levels rise, insulin is released to help cells absorb excess glucose, thereby lowering its concentration in the bloodstream. Glucagon, growth hormone, and glucocorticoids, in contrast, all play roles in increasing blood glucose levels through different mechanisms.
Which structure controls the hormones secreted by the pituitary gland?
Select the best answer.
Explanation:
The correct answer is the hypothalamus. The hypothalamus is a region of the brain located below the thalamus that plays a crucial role in controlling the pituitary gland. It releases hormones that either stimulate or inhibit hormone production in the pituitary gland, thus regulating various bodily functions. The adrenal gland, testes, and pancreas do not directly control the hormones secreted by the pituitary gland.
What percentage of a female's blood volume is composed of red blood cells?
Select the best answer.
Explanation:
Approximately 40% of a female's blood volume is composed of red blood cells, a proportion known as hematocrit. This percentage may vary slightly based on factors like age and overall health. Red blood cells play a crucial role in oxygen transport throughout the body, and deviations from the normal range can indicate various medical conditions.
During digestion, what does the stomach muscle churn and mix food into, turning it into a soupy substance known as which of the following?
Select the best answer.
Explanation:
The correct answer is C: Chyme. During digestion, the stomach muscle contracts and mixes food with digestive juices, breaking it down into a thick, soupy liquid called chyme. This chyme is then slowly released into the small intestine for further digestion and absorption of nutrients.
What is the function of aldosterone?
Select the best answer.
Explanation:
Aldosterone is a hormone produced by the adrenal glands that plays a key role in regulating sodium and potassium levels in the body. Its primary function is to conserve sodium by increasing its reabsorption in the kidneys, which helps maintain electrolyte balance and blood pressure. Therefore, the correct answer is B.
Which type of cholesterol is considered the best for health?
Select the best answer.
Explanation:
High-density lipoprotein (HDL) is considered the best type of cholesterol for health. HDL helps remove excess cholesterol from the bloodstream, reducing the risk of heart disease. Conversely, low-density lipoprotein (LDL) is often referred to as 'bad' cholesterol as it can lead to plaque buildup in arteries. Very low-density lipoprotein (VLDL) and very high-density lipoprotein (VHDL) are not commonly used terms in cholesterol classification.
Which structure of the nervous system carries action potential in the direction of a synapse?
Select the best answer.
Explanation:
The correct answer is B: axon. The axon is a long, slender projection of a neuron that conducts electrical impulses away from the neuron's cell body towards other neurons or target cells, such as muscles or glands, including towards a synapse. The cell body contains the nucleus and other organelles but does not carry action potentials. While a neuron is the overall structural and functional unit of the nervous system, the axon is specifically responsible for transmitting action potentials.
Where is the parathyroid gland located?
Select the best answer.
Explanation:
The parathyroid gland is located in the neck. It consists of four small glands situated behind the thyroid gland. These glands play a crucial role in regulating calcium levels in the body. The correct anatomical location of the parathyroid gland is in the neck, specifically behind the thyroid gland, making choice A the correct answer.
Where are all the nutrients that enter the hepatic portal vein routed for processing?
Select the best answer.
Explanation:
All the nutrients that enter the hepatic portal vein are routed to the liver for processing. The liver is responsible for detoxifying and metabolizing substances absorbed from the gastrointestinal tract before they enter the systemic circulation. It filters and processes nutrients, drugs, and toxins, ensuring that only safe and usable substances are distributed throughout the body.
What is the name of the process in the lungs by which oxygen is transported from the air to the blood?
Select the best answer.
Explanation:
The correct answer is B, diffusion. Diffusion is the process by which oxygen moves from an area of high concentration (in the air) to an area of low concentration (in the blood) through the alveoli in the lungs. Osmosis involves the movement of water molecules across a semipermeable membrane, not oxygen molecules. Dissipation refers to the dispersal or scattering of something. Reverse osmosis is a process used in water purification, which is not relevant to the transport of oxygen in the lungs.
Which of the following epithelial types is correctly matched with its major function?
Select the best answer.
Explanation:
The correct answer is D. Simple columnar epithelium is matched correctly with its major function of secretion or absorption. Simple squamous epithelium is best suited for diffusion due to its thin structure, while stratified squamous epithelium is mainly for protection against mechanical stress and pathogens. Stratified squamous epithelium does not function primarily in diffusion. Therefore, understanding the structure and function relationship of different epithelial types is crucial for correctly identifying their major functions.
Which of the following are tropic hormones? (Select one that doesn't apply.)
Select the best answer.
Explanation:
Tropic hormones are hormones that stimulate other endocrine glands to release their hormones. Antidiuretic hormone (C) is not a tropic hormone; it acts on the kidneys to regulate water balance. Somatotropin (A), follicle-stimulating hormone (B), and thyroid-stimulating hormone (D) are all tropic hormones that stimulate the release of hormones from other glands.
Which hormone is responsible for preparing the endometrium of the uterus for pregnancy?
Select the best answer.
Explanation:
Estrogen is the hormone responsible for initiating the preparation of the endometrium of the uterus for pregnancy. Estrogen helps thicken the endometrial lining, which is crucial for the implantation of a fertilized egg. It plays a vital role in the menstrual cycle and is primarily produced by the ovaries.
What is the name of the structure that prevents food from entering the airway?
Select the best answer.
Explanation:
The structure that prevents food from entering the airway is the epiglottis. The epiglottis is a flap of cartilage located behind the tongue at the top of the larynx. During swallowing, the epiglottis covers the opening of the trachea, directing food and liquids to the esophagus instead of entering the airway. This mechanism ensures that food safely passes into the digestive system, avoiding any blockage of the respiratory pathway.
What substance makes up the pads that provide support between the vertebrae?
Select the best answer.
Explanation:
Cartilage is the substance that makes up the pads providing support between the vertebrae. These pads, known as intervertebral discs, consist of tough outer layers of fibrous cartilage and a gel-like inner core. Cartilage plays a crucial role in cushioning the vertebrae, absorbing shock, and maintaining flexibility in the spine.
How many different types of tissues are there in the human body?
Select the best answer.
Explanation:
The human body is composed of four main types of tissues: epithelial, connective, muscle, and nervous tissue. Epithelial tissue covers body surfaces, connective tissue provides support and structure, muscle tissue allows movement, and nervous tissue coordinates body activities through electrical signals. Therefore, the correct answer is four.
A tissue examined under the microscope exhibits the following characteristics: cells found on the internal surface of the stomach, no extracellular matrix, tall and thin cells, and no blood vessels in the tissue. What type of tissue is this?
Select the best answer.
Explanation:
The correct answer is A: Epithelial. Epithelial tissue is characterized by cells tightly packed together that form a protective barrier on internal and external body surfaces. The description in the question matches the characteristics of epithelial tissue found lining the internal surface of organs like the stomach. This type of tissue lacks blood vessels and typically does not contain an extracellular matrix, which is a defining feature of connective tissue. Muscle tissue is composed of cells capable of contraction and relaxation, while cartilage is a type of connective tissue consisting of specialized cells embedded in a matrix.
Nerve tissue is composed of neurons and connective tissue cells that are referred to as which of the following?
Select the best answer.
Explanation:
Nerve tissue is made up of neurons that transmit signals and neuroglia cells that support and protect the neurons. Neuroglia cells play a crucial role in providing structural support, insulation, and nutrients to neurons. Osteoblasts are bone-forming cells, osteocytes are mature bone cells, and arterioles are small arteries that carry blood away from the heart. Therefore, the correct answer is option B, Neuroglia.
What is the name of the outermost layer of the skin?
Select the best answer.
Explanation:
The correct answer is B, 'epidermis.' The epidermis is the outermost layer of the skin, providing a protective barrier against environmental factors and regulating water loss. The dermis is located beneath the epidermis and contains important structures like blood vessels and glands. Subcutaneous tissue, also known as the hypodermis, is located below the dermis and serves functions such as insulation and energy storage.
What are the chemical messengers that control growth, differentiation, and the metabolism of specific target cells called?
Select the best answer.
Explanation:
Hormones are the correct answer. Hormones are signaling molecules produced by glands in the endocrine system. They travel through the bloodstream to target cells, where they regulate various physiological processes like growth, differentiation, and metabolism. Neurons are nerve cells that transmit information, glands produce and release hormones, and second messengers are molecules involved in intracellular signal transduction.
Your time is up
You’ve reached the end of your allocated time, but you can still review the questions and continue navigating the exam.
Restart exam?
Reset progress and restart the exam? Your current score will be saved before your answers are cleared.