Q: Which of the following equations correctly represents cardiac output?

$$\text{CO} = \text{HR} \times \text{SV}$$

Question 1

Which of the following best describes the principal characteristic of homeostasis?

Accepted Answer

A dynamic equilibrium where internal conditions are maintained within a narrow range despite external changes.

Question 2

Which feedback mechanism is primarily responsible for regulating blood glucose levels after a meal?

Accepted Answer

Negative feedback

Question 3

During vigorous exercise, which division of the autonomic nervous system is most active, and what are its effects?

Accepted Answer

Sympathetic; increases heart rate, dilates airways, and mobilizes glucose

Question 4

Which hormone is released by the adrenal medulla in response to sympathetic stimulation, and what is its primary effect?

Accepted Answer

Epinephrine; increases heart rate and blood glucose

Question 5

A patient presents with excessive bleeding after minor injuries. Laboratory tests reveal a deficiency in clotting factors. Which vitamin deficiency is most likely responsible?

Accepted Answer

Vitamin K

Question 6

Which of the following equations correctly represents cardiac output?

Accepted Answer

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

Question 7

Which of the following is a real-life example of positive feedback in the human body?

Accepted Answer

Enhancement of labor contractions by oxytocin

Question 8

A patient with chronic hypertension is at risk for which change in cardiac muscle cells?

Accepted Answer

Increased afterload and reduced stroke volume

Question 9

Which of the following statements about erythrocytes is correct?

Accepted Answer

They are anucleate and rely on anaerobic metabolism for ATP production.

Question 10

Which process is responsible for the removal of a blood clot after vessel repair, and which enzyme is central to this process?

Accepted Answer

Fibrinolysis; plasmin

Question 11

Which of the following best explains why hemoglobin is contained within erythrocytes rather than free in plasma?

Accepted Answer

To prevent hemoglobin loss and avoid excessive osmotic pressure

Question 12

Which of the following is a function of albumin in blood plasma?

Accepted Answer

Maintaining plasma osmotic pressure

Question 13

Which hormone is released in response to hypoxia and stimulates erythropoiesis?

Accepted Answer

Erythropoietin

Question 14

Which of the following is a correct sequence for the pathway of blood through the heart and pulmonary circuit?

Accepted Answer

Right atrium → tricuspid valve → right ventricle → pulmonary semilunar valve → pulmonary trunk → pulmonary arteries → lungs

Question 15

Which of the following best describes the mechanism of action for water-soluble hormones?

Accepted Answer

They bind to plasma membrane receptors and activate second messenger systems such as cAMP.

Question 16

A patient receives a transfusion of mismatched blood. Which immediate effect is most likely to occur?

Accepted Answer

Agglutination and destruction of donor RBCs

Question 17

Which equation correctly represents stroke volume?

Accepted Answer

$$	ext{SV} = 	ext{EDV} - 	ext{ESV}$$

Question 18

Which of the following is a real-world example of antagonistic hormone interaction?

Accepted Answer

Insulin and glucagon regulating blood glucose levels

Question 19

Which structure in the heart is responsible for initiating the electrical impulse that sets the basic rhythm?

Accepted Answer

Sinoatrial (SA) node

Question 20

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

Accepted Answer

The greater the preload (venous return), the greater the force of contraction and stroke volume.

Homeostasis, Autonomic Nervous System, Endocrine System, and Blood: Foundations for Human Physiology

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