$\text{Cardiac Output} = \text{Stroke Volume} \times \text{Heart Rate}$

$\text{Blood Flow} = \frac{\text{Blood Pressure}}{\text{Resistance}}$

Question 1

Which structure in a neuron is primarily responsible for receiving signals from other neurons?

Accepted Answer

Dendrites

Question 2

What is the main function of the myelin sheath surrounding axons?

Accepted Answer

To insulate the axon and speed up action potential conduction

Question 3

During the cardiac cycle, which phase is characterized by the contraction of the heart and highest arterial blood pressure?

Accepted Answer

Systole

Question 4

Which valves prevent backflow of blood from the ventricles to the atria?

Accepted Answer

Atrioventricular (AV) valves

Question 5

What is the correct sequence of electrical impulse transmission in the heart?

Accepted Answer

SA node → AV node → Bundle branches → Purkinje fibers

Question 6

Which blood vessel has the slowest velocity of blood flow, and why?

Accepted Answer

Capillaries, due to large total cross-sectional area

Question 7

What is the primary function of the capillary beds in the circulatory system?

Accepted Answer

To facilitate the exchange of O$_2$ and CO$_2$ by diffusion

Question 8

Which equation best represents the relationship between cardiac output, heart rate, and stroke volume?

Accepted Answer

$	ext{Cardiac Output} = 	ext{Stroke Volume} 	imes 	ext{Heart Rate}$

Question 9

Which structure in the heart acts as the pacemaker, setting the rate and timing of cardiac muscle contraction?

Accepted Answer

Sinoatrial (SA) node

Question 10

Why is blood flow in capillaries necessarily slow?

Accepted Answer

Because the high resistance and large total cross-sectional area allow for efficient exchange of materials

Question 11

Which of the following best describes the direction of signal transmission in a neuron?

Accepted Answer

From dendrites to axon

Question 12

What is the main function of the AV node in the heart's electrical conduction system?

Accepted Answer

To delay the electrical impulse before it travels to the ventricles

Question 13

Which of the following statements about arteries and veins is correct?

Accepted Answer

Arteries carry blood away from the heart, veins carry blood toward the heart

Question 14

During diastole, what happens to the elastic walls of the arteries?

Accepted Answer

They snap back, maintaining blood pressure

Question 15

Which of the following is NOT a function of the endothelium lining blood vessels?

Accepted Answer

Producing electrical impulses

Question 16

Which equation describes the relationship between blood pressure, blood flow, and resistance?

Accepted Answer

$	ext{Blood Flow} = \frac{	ext{Blood Pressure}}{	ext{Resistance}}$

Question 17

Which of the following best explains why arteries remain pressurized throughout the cardiac cycle?

Accepted Answer

Because the elastic walls of arteries snap back during diastole

Question 18

What is the physiological significance of the delay at the AV node during the cardiac cycle?

Accepted Answer

It allows the atria to finish contracting and empty blood into the ventricles before the ventricles contract

Question 19

Which of the following is true regarding the pulse?

Accepted Answer

It is the rhythmic bulging of artery walls with each heartbeat

Question 20

Which structure is responsible for preventing backflow of blood into the ventricles from the aorta and pulmonary artery?

Accepted Answer

Semilunar valves

Neurons, Nervous System, and Circulatory System: Structure and Function

Study Guide - Practice Questions