Which blood vessel carries blood away from the heart? MCQ with Answer and Explanation

Explanation:
Bones store minerals (1) and contain marrow for hematopoiesis (2). Ligaments connect bone to bone; tendons connect muscle to bone. So 3 is incorrect.

Explanation:
In the biogeochemical carbon cycle, carbon dioxide (CO2) is removed from the atmosphere primarily by autotrophs (plants, algae) through the process of photosynthesis, where it is fixed into organic compounds (glucose). Carbon is returned to the atmosphere through respiration (by plants and animals), decomposition of dead organic matter, and combustion of fossil fuels.

Explanation:
The hypothalamus regulates body temperature, hunger, and thirst, and controls the pituitary. Reflex actions are primarily coordinated by the spinal cord, not the hypothalamus. Hence, D is incorrect.