HESI A2
HESI A2 Anatomy and Physiology Quizlet 2024
1. How do the intercostal muscles between the ribs assist with respiration?
- A. By protecting the delicate bronchioles and alveoli
- B. By signaling a decrease in intra-alveolar pressure
- C. By enlarging and reducing the space in the thorax
- D. By maintaining a medial separation between pleurae
Correct answer: C
Rationale: The intercostal muscles located between the ribs play a crucial role in respiration by aiding in the enlargement and reduction of the space in the thorax. During inspiration, these muscles contract, lifting the rib cage, which increases the volume of the thoracic cavity and allows the lungs to expand and fill with air. This process directly relates to the expansion of the thorax rather than protecting bronchioles and alveoli (Choice A), signaling intra-alveolar pressure changes (Choice B), or maintaining the separation between pleurae (Choice D). Therefore, the correct answer is C.
2. How does a transverse section divide the body?
- A. Into right and left regions
- B. Into upper and lower regions
- C. Into front and back regions
- D. Between the dorsal and ventral cavities
Correct answer: B
Rationale: A transverse section, also known as a cross-section, divides the body into upper and lower regions. This type of section cuts across the body horizontally, creating a division between the superior (upper) and inferior (lower) portions of the body. Choice A is incorrect as dividing the body into right and left regions is typically done by a sagittal section. Choice C is incorrect as dividing the body into front and back regions is usually achieved by a frontal section. Choice D is incorrect as it refers more to the relationship between dorsal and ventral cavities rather than the actual division of the body.
3. The corpus callosum facilitates communication between which brain structures?
- A. the left and right brain
- B. the skeletal and neural systems
- C. the brain and spinal cord
- D. the thalamus and hypothalamus
Correct answer: A
Rationale: The corpus callosum is a structure in the brain that enables communication between the two hemispheres. It allows for the transfer of various types of information, such as motor, sensory, and cognitive, between the left and right brain hemispheres, aiding in overall brain function and integration of tasks. Choices B, C, and D are incorrect as they do not involve the specific brain structures connected by the corpus callosum.
4. Beriberi is a disease caused by a lack of ___________.
- A. thiamine
- B. vitamin C
- C. niacin
- D. protein
Correct answer: A
Rationale: Beriberi is a disease caused by a deficiency of thiamine, also known as vitamin B1. Thiamine is essential for the proper functioning of the nervous system and energy metabolism in the body. Without enough thiamine, individuals may develop symptoms such as weakness, fatigue, nerve damage, and heart problems, which are characteristic of beriberi. Vitamin C (choice B), niacin (choice C), and protein (choice D) deficiencies can cause other health issues but are not directly related to beriberi.
5. The vena cavae drain blood from the body into the ___________.
- A. right atrium
- B. right ventricle
- C. left atrium
- D. left ventricle
Correct answer: A
Rationale: The vena cavae are large veins responsible for returning deoxygenated blood from the body to the heart. They empty into the right atrium of the heart. From the right atrium, the blood is then pumped into the right ventricle before being sent to the pulmonary circulation for oxygenation, making choice A, 'right atrium,' the correct answer. Choices B, C, and D are incorrect because the vena cavae do not empty into the ventricles of the heart; instead, they deliver blood to the atria.
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