which part of the brain is involved in the regulation of heart rate and blood pressure

HESI A2

Anatomy HESI A2 Practice Test

1. Which brain part is responsible for regulating heart rate and blood pressure?

A. Cerebellum
B. Medulla oblongata
C. Hypothalamus
D. Pons

Correct answer: B

Rationale: The medulla oblongata, situated in the brainstem, plays a crucial role in controlling essential functions like heart rate, blood pressure, and breathing. It contains vital cardiovascular and respiratory centers, making it the correct choice for the regulation of heart rate and blood pressure. The cerebellum is primarily involved in coordinating movement and balance, not in regulating heart rate and blood pressure. The hypothalamus is responsible for maintaining homeostasis, regulating body temperature, hunger, and thirst, but not specifically heart rate and blood pressure. The pons is involved in functions like sleep, respiration, and bladder control, not primarily in regulating heart rate and blood pressure.

2. Which of the following elements does not exist as a diatomic molecule?

A. boron
B. fluorine
C. oxygen
D. nitrogen

Correct answer: A

Rationale: The correct answer is 'boron.' Diatomic molecules consist of two atoms of the same element bonded together. Boron is an exception and does not exist naturally as a diatomic molecule. On the other hand, fluorine, oxygen, and nitrogen commonly exist as diatomic molecules in their natural states. Fluorine, for example, exists as F2, oxygen exists as O2, and nitrogen exists as N2.

3. The patient fractured the lateral portion of the hip bone, which is known as the _____.

A. ilium
B. ileum
C. icterus
D. ileus

Correct answer: A

Rationale: The correct answer is A, "ilium." The ilium is the lateral, or outer, portion of the hip bone. Choices B, C, and D are incorrect. Option B, "ileum," refers to a part of the small intestine. Option C, "icterus," is a term for jaundice, a condition related to the liver. Option D, "ileus," is a term for intestinal obstruction, which is unrelated to the hip bone.

4. The US __________ most of its silicone chips from Japan and China to stay competitive in the tech market.

A. Deports
B. Exports
C. Reports
D. Imports

Correct answer: D

Rationale: The US imports most of its silicone chips from Japan and China, indicating that the silicone chips are being brought into the US from these countries. 'Imports' refers to the act of bringing goods or services into one country from another, which accurately describes the scenario described in the question. The other choices are incorrect: 'Deports' means expelling individuals from a country, 'Exports' mean sending goods to another country, and 'Reports' mean providing information or data.