Question 1

Which of the following best describes the effect of aortic baroreceptor stimulation on blood pressure regulation?

Accepted Answer

It causes reflexive vasodilation, lowering blood pressure.

Question 2

Which vessel is most likely to have the highest resistance to blood flow according to Poiseuille’s Law $R = \frac{8 \eta l}{\pi r^4}$?

Accepted Answer

A small arteriole

Question 3

What is the primary function of the lymph nodes in the lymphatic system?

Accepted Answer

Filtration of lymph and activation of immune responses

Question 4

Which of the following is responsible for cellular immunity?

Accepted Answer

T lymphocytes

Question 5

A patient presents with increased peripheral resistance. Which of the following is most likely to occur?

Accepted Answer

Increased afterload on the heart

Question 6

Which of the following best explains why veins are considered capacitance vessels?

Accepted Answer

They store large volumes of blood at low pressure.

Question 7

Which of the following is a direct effect of increased CO2 in the blood?

Accepted Answer

Stimulation of chemoreceptors leading to increased respiratory rate

Question 8

Which of the following is the correct sequence for the flow of air from the nose to the alveoli?

Accepted Answer

Nasal cavity → pharynx → larynx → trachea → bronchi → bronchioles → alveoli

Question 9

Which law describes the relationship between the pressure and volume of a gas in the lungs?

Accepted Answer

Boyle’s Law: $P_1 V_1 = P_2 V_2$

Question 10

Which of the following is the main function of the respiratory defense system?

Accepted Answer

To filter, warm, and humidify incoming air

Question 11

Which of the following cells are responsible for the production of immunoglobulins?

Accepted Answer

Plasma cells

Question 12

A patient with asthma is experiencing bronchoconstriction. Which of the following is most likely to be decreased?

Accepted Answer

Alveolar ventilation

Question 13

Which of the following best describes the role of alveolar macrophages?

Accepted Answer

They phagocytose debris and pathogens in the alveoli.

Question 14

Which of the following is a function of cytotoxic T cells?

Accepted Answer

Direct killing of infected or abnormal cells

Question 15

Which of the following is most likely to occur when ANP and BNP are elevated?

Accepted Answer

Decreased blood volume and blood pressure

Question 16

Which of the following is the primary function of the spleen in the lymphatic system?

Accepted Answer

Filtration of blood and removal of old erythrocytes

Question 17

Which of the following best describes the effect of aldosterone on blood pressure?

Accepted Answer

It increases sodium reabsorption, raising blood pressure.

Question 18

Which of the following is a characteristic of the thymus gland?

Accepted Answer

It is the site of T lymphocyte maturation.

Question 19

Which of the following best explains why it is better to breathe through the nose than the mouth?

Accepted Answer

The nose filters, warms, and humidifies the air more effectively.

Question 20

Which of the following is the main function of the superior mesenteric artery?

Accepted Answer

To supply blood to the small intestine and part of the large intestine

Chapters 21-23: Circulatory, Lymphatic, and Respiratory Systems – Study Guide

Study Guide - Practice Questions