The hormone that stimulates the formation of red blood cells is: MCQ with Answer and Explanation

Explanation:
The SA node, located in the right atrium, spontaneously generates electrical impulses, setting the heart rate. It is the natural pacemaker. The AV node delays the impulse before it reaches the ventricles.

Explanation:
Thyroid-stimulating hormone (TSH), secreted by the anterior pituitary, binds to receptors on thyroid follicular cells and stimulates them to produce and release T₃ and T₄. ACTH stimulates adrenal cortex, FSH and LH target gonads.

Explanation:
The lymphatic system includes lymph, lymphatic capillaries, vessels, ducts, and lymphoid organs (nodes, spleen, thymus). It returns tissue fluid to the blood, absorbs fats, and defends against pathogens.