Question

functions: protects against pathogens; receives stimuli from the environment; helps control body temperature; produces vitamin d; removes some waste (sweat)
choose an answer
1 respiratory system
2 cardiovascular system
3 skeletal system
4 integumentary system

Explanation:

The integumentary system consists of the skin, hair, nails, and associated glands. The skin acts as a physical barrier protecting against pathogens. It has sensory receptors that receive stimuli from the environment. Through processes like sweating, it helps in thermoregulation (controlling body temperature) and also excretes some waste. Additionally, the skin is involved in the synthesis of vitamin D when exposed to sunlight. The respiratory system is mainly for gas exchange (taking in oxygen and expelling carbon dioxide), the cardiovascular system is about blood circulation, and the skeletal system provides support and protection for internal organs and is involved in movement (along with muscles).

Answer:

4 Integumentary System