$$CO = 80 \times 75 = 6000 \text{ mL/min}$$

Question 1

Which of the following best describes the primary function of the innate immune system?

Accepted Answer

To provide immediate, non-specific defense against infection

Question 2

During moderate-intensity exercise, which change is most likely to occur in the cardiovascular system?

Accepted Answer

Increase in cardiac output and stroke volume

Question 3

Which equation correctly calculates mean arterial pressure (MAP)?

Accepted Answer

$$MAP = DBP + \frac{1}{3}(SBP - DBP)$$

Question 4

Which vessel type accounts for the most resistance in the pulmonary circulation?

Accepted Answer

Arterioles

Question 5

What is the primary mechanism for hydrogen ion ($$H^+) $$production during exercise?

Accepted Answer

Anaerobic glycolysis leading to lactic acid formation

Question 6

Which of the following best explains the 'open window' theory in relation to exercise and infection?

Accepted Answer

Intense exercise temporarily increases susceptibility to infection

Question 7

Which law describes the relationship between the partial pressure of a gas and its concentration in a liquid?

Accepted Answer

Henry's Law

Question 8

A patient has a stroke volume of 80 mL and a heart rate of 75 bpm. What is their cardiac output?

Accepted Answer

$$CO = 80 	imes 75 = 6000 	ext{ mL/min}$$

Question 9

Which of the following is a key difference between the conducting zone and the respiratory zone of the lungs?

Accepted Answer

The respiratory zone contains alveoli for gas exchange

Question 10

Which factor does blood flow resistance depend on according to Poiseuille's Law?

Accepted Answer

Vessel radius, blood viscosity, and vessel length

Question 11

During exercise, oxygen demand increases by approximately how much compared to rest?

Accepted Answer

15-20 times

Question 12

Which of the following best describes the Frank-Starling mechanism?

Accepted Answer

Greater ventricular filling leads to stronger contraction and increased stroke volume

Question 13

Which of the following ions has a higher concentration inside the cell compared to outside?

Accepted Answer

Potassium ($$K^+)$$

Question 14

What does the oxyhemoglobin dissociation curve represent?

Accepted Answer

The relationship between $$PO_2$$ and hemoglobin saturation

Question 15

Which of the following is the pacemaker of the heart?

Accepted Answer

Sinoatrial (SA) node

Question 16

Which process is responsible for maintaining the resting membrane potential in neurons?

Accepted Answer

Active transport via the sodium-potassium pump

Question 17

Which of the following best describes the length-tension relationship in skeletal muscle?

Accepted Answer

Force production is greatest at an optimal muscle length

Question 18

Which of the following is a primary function of muscle spindles?

Accepted Answer

Detect changes in muscle length

Question 19

Which equation represents cardiac output ($$CO$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 20

Which of the following best explains how acidosis can impair muscle contraction during intense exercise?

Accepted Answer

Acidosis interferes with actin-myosin cross-bridge formation

Comprehensive Study Guide: Exercise, Immune System, and Personal Health Physiology

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