HESI A2
HESI A2 Anatomy and Physiology 2023
1. Which part of the brain is involved in the regulation of heart rate and breathing?
- A. Cerebrum
- B. Cerebellum
- C. Medulla oblongata
- D. Hypothalamus
Correct answer: C
Rationale: The correct answer is C: Medulla oblongata. The medulla oblongata, situated in the brainstem, plays a crucial role in regulating vital functions such as heart rate, breathing, and blood pressure. It serves as the control center for involuntary actions, ensuring the body's automatic functions work properly. Choices A, B, and D are incorrect because the cerebrum is primarily responsible for functions such as thinking, voluntary movements, and sensory processing; the cerebellum is involved in coordination, balance, and muscle control; and the hypothalamus regulates body temperature, thirst, hunger, and some aspects of the autonomic nervous system but not specifically heart rate and breathing.
2. What is the primary function of the lymphatic system?
- A. Transport oxygen to cells
- B. Remove carbon dioxide from the body
- C. Produce hormones
- D. Transport nutrients
Correct answer: B
Rationale: The correct answer is B: Remove carbon dioxide from the body. The primary function of the lymphatic system is to return excess tissue fluid to the bloodstream and assist in the body's defense against infections by filtering out harmful pathogens and foreign particles. Choices A, C, and D are incorrect because transporting oxygen to cells is mainly done by the circulatory system, hormone production is primarily carried out by endocrine glands, and nutrient transport is also a function of the circulatory system and the digestive system, not the lymphatic system.
3. How does the nervous system work with the muscular system?
- A. The muscles of the body produce chemicals that feed the nerves.
- B. The nervous system tells the muscles how to respond to the environment.
- C. The nervous system releases chemicals that remove excess waste from the muscles.
- D. The muscular system provides input that allows the nerves to make decisions.
Correct answer: B
Rationale: The correct answer is B because the nervous system communicates with the muscular system to control voluntary and involuntary muscle movements. The nervous system sends signals to the muscles, instructing them on how to respond to various stimuli in the environment. This communication allows for coordinated movement and responses to external and internal changes. Choice A is incorrect because muscles do not produce chemicals to feed the nerves. Choice C is incorrect because the nervous system does not release chemicals to remove waste from the muscles. Choice D is incorrect because the muscular system does not provide input for the nerves to make decisions.
4. Which gland is responsible for regulating metabolism and growth?
- A. Thyroid gland
- B. Pituitary gland
- C. Adrenal gland
- D. Pineal gland
Correct answer: A
Rationale: The correct answer is the Thyroid gland. The thyroid gland is responsible for regulating metabolism and growth. It produces hormones such as thyroxine (T4) and triiodothyronine (T3), which play essential roles in controlling metabolic processes, growth, and development throughout the body. Choice B, the Pituitary gland, although important for hormone regulation, is not primarily responsible for regulating metabolism and growth. Choices C and D, the Adrenal gland and Pineal gland, respectively, have different functions and are not primarily involved in regulating metabolism and growth.
5. Which cellular structure is responsible for energy production?
- A. Nucleus
- B. Mitochondria
- C. Ribosome
- D. Golgi apparatus
Correct answer: B
Rationale: Corrected Question: Mitochondria are organelles known as the powerhouses of the cell. They generate energy through cellular respiration, producing ATP, which is used for various cellular functions. This process is crucial for providing the energy necessary to fuel cellular activities and sustain life. The other choices, the nucleus, ribosome, and Golgi apparatus, are important cellular structures but are not directly responsible for energy production. The nucleus houses the cell's genetic material, the ribosome is involved in protein synthesis, and the Golgi apparatus is responsible for processing and packaging proteins.
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