13. The coronary arteries are primarily responsible for delivering oxygenated blood to which of the following structures?

21. Which of the following factors most significantly affects vascular resistance, thereby influencing blood flow and arterial pressure within the circulatory system?

Which organ is primarily responsible for producing erythropoietin, the hormone that stimulates red blood cell production?

28. Which statement accurately describes the relationship between blood flow, pressure, and resistance as outlined by the principles of hemodynamics?

Which blood disorder is characterized by an abnormally low number of platelets?

Which of the following is a function of the thyroid hormones T3 and T4?

Which of the following would likely lead to increased renin secretion?

12. Stimulation of the sympathetic nervous system exerts which of the following effects on cardiac function through its action on adrenergic receptors?

15. Ventricular systole refers to which phase of the cardiac cycle, characterized by what specific mechanical action of the ventricles?

17. The primary physiological role of capillaries within the circulatory system is to: