Which hormone regulates the blood calcium level by lowering it? MCQ with Answer and Explanation

Explanation:
Parathyroid hormone (PTH) activates the enzyme 1-α-hydroxylase in the kidney, converting vitamin D to its active form, which then increases calcium absorption.

Explanation:
The hypothalamus is a small region in the forebrain that maintains homeostasis by regulating body temperature, hunger, thirst, sleep, and emotions. It also controls pituitary gland secretions. The cerebellum coordinates movement, medulla controls respiration and heart rate, pons relays signals. Hypothalamus acts as the body's thermostat and the link between nervous and endocrine systems.

Explanation:
Photosynthesis, the process of converting light energy into chemical energy (glucose), occurs in the chloroplasts of plant cells, specifically involving the thylakoid membranes and stroma. Cellular respiration, the process of breaking down glucose to release ATP for cellular work, occurs primarily in the mitochondria of both plant and animal cells. Transpiration is the loss of water vapor from the aerial parts of the plant, primarily through the stomata on the leaves, not through the roots (which absorb water). Thus, statements 1 and 2 are correct.