BIOCHEMISTRY, BIOMEDICINE & PHARMACEUTICS

Angiotensin II Receptor Blockers (ARBs) are a class of medications commonly used to treat hypertension (high blood pressure). They work by targeting the renin-angiotensin-aldosterone system (RAAS), a regulatory system that plays a significant role in blood pressure control. Here's how ARBs work to treat hypertension: Blockade of Angiotensin II Receptors: ARBs work by blocking the action of angiotensin II at its receptors, specifically the angiotensin II type 1 receptors (AT1 receptors). Angiotensin II is a potent vasoconstrictor, meaning it causes blood vessels to narrow. By inhibiting the effects of angiotensin II, ARBs prevent blood vessels from constricting, leading to vasodilation (widening of the blood vessels). Vasodilation: The vasodilation induced by ARBs results in a reduction in peripheral vascular resistance. With less resistance to blood flow, blood can move more easily through the blood vessels. As a consequence, the heart does not have to work as hard to pump blood, a...

Beta-blockers are a class of medications commonly prescribed to reduce hypertension (high blood pressure). They work by affecting the sympathetic nervous system and specific receptors in the body, primarily beta-adrenergic receptors. Here's how beta-blockers reduce hypertension: Decreasing Heart Rate: Beta-blockers block the action of adrenaline (epinephrine) and other similar hormones on beta-adrenergic receptors in the heart. By doing so, they reduce the heart rate. A slower heart rate means that the heart pumps blood with less force and less frequently, resulting in decreased cardiac output. This reduction in cardiac output leads to a decrease in blood pressure. Reducing Contractility: Beta-blockers also reduce the force of contraction of the heart muscle. This effect, known as negative inotropy, means that the heart muscle contracts less forcefully with each beat. As a result, the heart pumps out less blood with each beat, leading to a decrease in stroke volume (the amount of b...

Cardiovascular system Multiple Choice Questions 1. All of the following agents are high ceiling diuretics except: a. Furosemide b. Amiloride c. Torsemide d. Ethacrynic acid 2. Which of the following statement is true for ACE inhibitors? a. ACE inhibitors reduce both cardiac preload and afterload, thereby decreasing cardiac work b. ACE inhibitors increase both angiotensin II and bradykinin levels c. ACE inhibitors decrease both angiotensin II and bradykinin levels d. None of the above 3. Choose the correct antihypertensive agents and their mechanism of action: a. Furosemide: inhibition of epithelial sodium transport at the late distal and collecting ducts b. Losartan: increases aldosterone secretion causing sodium and water retention c. Clonidine: acts centrally as an a2 agonist causing inhibition of sympathetic vasomotor center d. a and c e. a, b and c 4. Which...