Question 1

Which of the following best describes the difference between endocrine and nervous system signaling?

Accepted Answer

Endocrine signals are slower and longer-lasting, while nervous signals are faster and short-lived.

Question 2

A patient presents with symptoms of hyperthyroidism. Which of the following would most likely be observed in their endocrine feedback pathway?

Accepted Answer

Decreased secretion of thyroid-stimulating hormone (TSH) from the anterior pituitary due to high thyroid hormone levels.

Question 3

Which of the following hormones is produced by the hypothalamus and stored in the posterior pituitary?

Accepted Answer

Oxytocin

Question 4

Steroid hormones differ from peptide hormones in their mechanism of action because:

Accepted Answer

Steroid hormones bind to intracellular receptors and directly affect gene transcription.

Question 5

Which of the following equations correctly calculates cardiac output ($$CO) $$given stroke volume ($$SV) $$and heart rate ($$HR$$)?

Accepted Answer

$$CO = SV 	imes HR$$

Question 6

A patient has an end diastolic volume ($$EDV) of 120 mL $$and an end systolic volume ($$ESV) of 50 mL. $$What is their stroke volume ($$SV$$)?

Accepted Answer

$$SV = EDV - ESV = 120\,mL - 50\,mL = 70\,mL$$

Question 7

Which of the following best explains the Frank-Starling Law of the heart?

Accepted Answer

The greater the stretch of cardiac muscle cells during diastole, the stronger the subsequent contraction.

Question 8

Which of the following is a function of the fibrous pericardium?

Accepted Answer

It anchors the heart in the thoracic cavity and prevents overfilling.

Question 9

Which of the following best describes the role of arterioles in regulating blood pressure?

Accepted Answer

Arterioles regulate tissue blood flow and systemic arterial blood pressure by changing their diameter.

Question 10

Which equation relates blood flow ($$F$$), pressure difference ($$\Delta P$$), and resistance ($$R$$)?

Accepted Answer

$$F = \frac{\Delta P}{R}$$

Question 11

A patient has a systolic blood pressure of 130 mmHg and a diastolic blood pressure of 80 mmHg. What is their mean arterial pressure ($$MAP$$)?

Accepted Answer

$$MAP = \frac{1}{3} (Systolic - Diastolic) + Diastolic = \frac{1}{3} (130 - 80) + 80 = 96.7\,mmHg$$

Question 12

Which of the following is a likely consequence of left ventricular failure?

Accepted Answer

Pulmonary edema due to increased pressure in the pulmonary circulation.

Question 13

Which hormone is secreted by the adrenal cortex and is involved in the body's response to stress?

Accepted Answer

Cortisol

Question 14

Which of the following best describes the function of the hepatic portal system?

Accepted Answer

It transports nutrient-rich blood from the digestive organs to the liver for processing.

Question 15

Which of the following would most likely result in edema?

Accepted Answer

Increased net filtration pressure ($$NFP) in $$capillaries and impaired lymphatic drainage.

Question 16

Which of the following best describes the effect of positive inotropic agents on the heart?

Accepted Answer

They increase the force of myocardial contraction.

Question 17

Which of the following is a primary function of capillaries?

Accepted Answer

To facilitate exchange of gases, nutrients, and wastes between blood and tissues.

Question 18

Which of the following best explains the role of the baroreceptor reflex in blood pressure regulation?

Accepted Answer

It increases blood pressure by stimulating vasoconstriction when blood pressure drops.

Question 19

Which of the following is a likely effect of a lack of iodine in the diet?

Accepted Answer

Decreased production of thyroid hormones, leading to goiter.

Endocrine System, Heart, and Vascular System: Structured Study Guide

Study Guide - Practice Questions