ATI RN
Cardiovascular System Questions and Answers Questions
Question 1 of 5
Which of the following type of muscle contains the largest number of mitochondria per cell?
Correct Answer: C
Rationale: Cardiac muscle (C) has the most mitochondria per cell due to its constant energy demand. Smooth (A) has fewer, skeletal (B) varies, and D is incorrect.
Question 2 of 5
Valve through which the right ventricle pumps blood
Correct Answer: B
Rationale: The right ventricle pumps blood through the pulmonary semilunar valve (B) into the pulmonary artery. Tricuspid (A) is inflow, aortic (C) and mitral (D) are left-sided.
Question 3 of 5
The hormone that increases water reabsorbed by the kidney
Correct Answer: B
Rationale: ADH (B) increases water reabsorption in the kidneys, raising blood volume. Aldosterone (A) affects sodium, ANP (C) reduces volume, epinephrine (D) is stress-related.
Question 4 of 5
Which of the following plasma proteins plays a role in blood clotting?
Correct Answer: C
Rationale: Fibrinogen (C) is key in clotting, forming fibrin. Albumin (A) and globulins (B) have other roles; prostaglandins (D) are signaling molecules.
Question 5 of 5
The intrinsic and extrinsic pathways of blood clotting are identical after formation of
Correct Answer: B
Rationale: Prothrombinase (B) formation unites both pathways, converting prothrombin to thrombin. Thromboplastin (A) is extrinsic, factor XII (C) is intrinsic, fibrin (D) is later.