Q: Which equation correctly calculates mean arterial pressure (MAP)?

$$\text{MAP} = \text{Diastolic Pressure} + \frac{1}{3}(\text{Systolic Pressure} - \text{Diastolic Pressure})$$

Question 1

Which of the following best describes the relationship between the sympathetic nervous system and the adrenal medulla, and why do the effects of the adrenal medulla last longer than direct sympathetic stimulation?

Accepted Answer

The adrenal medulla releases catecholamines (epinephrine and norepinephrine) into the bloodstream, causing prolonged effects compared to direct sympathetic nerve stimulation.

Question 2

Which of the following is the best definition of a hormone?

Accepted Answer

A chemical messenger secreted into the bloodstream by endocrine glands that regulates the function of distant target cells.

Question 3

Which of the following correctly matches the structure with its function in the hypothalamic-pituitary axis?

Accepted Answer

The hypothalamus produces releasing and inhibiting hormones that regulate the anterior pituitary.

Question 4

Which of the following statements best distinguishes steroid hormones from non-steroid hormones?

Accepted Answer

Steroid hormones are derived from cholesterol and can cross the plasma membrane to bind intracellular receptors, while non-steroid hormones are usually amino acid-based and bind to cell surface receptors.

Question 5

A patient presents with muscle weakness, weight loss, and low blood pressure. Laboratory tests reveal low cortisol and aldosterone levels. Which endocrine disorder is most likely?

Accepted Answer

Addison's disease

Question 6

Which of the following best describes the negative feedback loop involving the hypothalamus, pituitary gland, and thyroid gland?

Accepted Answer

High levels of thyroid hormone inhibit the release of TRH from the hypothalamus and TSH from the anterior pituitary, reducing further thyroid hormone production.

Question 7

Which of the following scenarios best illustrates upregulation of hormone receptors?

Accepted Answer

A target cell increases the number of receptors in response to low hormone concentration, making it more sensitive to the hormone.

Question 8

Which of the following correctly describes the flow of blood through the heart?

Accepted Answer

Right atrium → right ventricle → pulmonary artery → lungs → left atrium → left ventricle → aorta

Question 9

Which layer of the heart wall is responsible for the contractile force of the heart?

Accepted Answer

Myocardium

Question 10

During the cardiac cycle, which phase is characterized by all heart valves being closed and no change in ventricular volume?

Accepted Answer

Isovolumetric contraction

Question 11

Which equation correctly calculates mean arterial pressure (MAP)?

Accepted Answer

$$	ext{MAP} = 	ext{Diastolic Pressure} + \frac{1}{3}(	ext{Systolic Pressure} - 	ext{Diastolic Pressure})$$

Question 12

Which wave on an ECG corresponds to ventricular depolarization?

Accepted Answer

QRS complex

Question 13

Which of the following best explains why endurance training leads to a lower resting heart rate?

Accepted Answer

Training increases stroke volume, so cardiac output is maintained with fewer beats per minute.

Question 14

Which type of capillary is most commonly found in the kidneys and is specialized for filtration?

Accepted Answer

Fenestrated capillaries

Question 15

Which of the following best describes the role of the renin-angiotensin-aldosterone system (RAAS)?

Accepted Answer

It increases blood pressure by causing vasoconstriction and promoting sodium and water retention.

Question 16

Which receptor type detects changes in blood pressure and where are these receptors primarily located?

Accepted Answer

Baroreceptors; carotid sinus and aortic arch

Question 17

Which of the following best describes the net movement of water across a capillary bed under normal physiological conditions?

Accepted Answer

Hydrostatic pressure pushes water out of the capillary at the arterial end, while colloid osmotic pressure draws water back in at the venous end.

Question 18

Which of the following statements about blood vessel structure is correct?

Accepted Answer

The tunica media contains smooth muscle and is responsible for vasoconstriction and vasodilation.

Question 19

Which of the following best explains why veins have lower pressure than arteries?

Accepted Answer

Veins have thinner walls and larger lumens, and blood pressure drops as blood moves through the systemic circuit.

Question 20

Which of the following equations correctly calculates cardiac output (CO)?

Accepted Answer

$$	ext{CO} = 	ext{SV} 	imes 	ext{HR}$$

BIO169 Unit 1: Endocrine and Cardiovascular System Study Guide

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