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General Medicine
Fibrinogen is essential for blood clot formation as it is converted into fibrin by thrombin. However, its role is not in dissolving blood clots; that is primarily the function of plasminogen, which is converted to plasmin.
Physiology
Answer: 4) Increase in heart rate and increase in stroke volume
Explanation: Thyroid hormones, such as thyroxine (T4) and triiodothyronine (T3), enhance the effects of catecholamines on the cardiovascular system, leading to increased heart ra
Physiology
Acetylcholine, released by the vagus nerve, acts on the SA node to slow down the heart rate by hyperpolarizing the membranes of the SA node cells and decreasing their automaticity.