What causes increased afterload in the left ventricle due to arterial stiffness during hypertension?

💡 Explanation

Arterial stiffness raises blood pressure and increases systemic vascular resistance because the arteries lose their elasticity. Therefore, the left ventricle must work harder to eject blood, leading to increased afterload, rather than changes in venous return or ANP secretion.

• Why does core body temperature initially rise during heatstroke, despite compensatory mechanisms like sweating and vasodilation?
• Why does accommodation lag (the delay in focusing on near objects) increase more sharply in individuals with early-stage presbyopia compared to age-matched individuals with normal vision?
• What distinguishes the urea cycle in the liver from the Cori cycle during prolonged starvation?
• If a drug increases GLP-1 secretion but impairs ghrelin production, which consequence follows for a patient with insulin resistance?
• Why does therapeutic hypothermia sometimes fail to prevent neuronal damage after ischemic stroke, even when reperfusion is achieved?
• Why does a drug that blocks reuptake transporters in a synapse often prolong the effect of a neurotransmitter, rather than simply increasing its concentration?