Question 18

The integumentary system functions to protect the body from exposure and can help to regulate temperature.

The integumentary system includes the skin, hair, nails, and associated glands, serving as a barrier against environmental factors and playing a crucial role in temperature regulation.

A) Urinary

The urinary system primarily functions to remove waste products from the body and regulate fluid balance. While it plays a role in maintaining homeostasis, it does not directly protect the body from exposure to environmental factors or regulate temperature.

B) Integumentary

The integumentary system is responsible for protecting the body from external threats such as pathogens and harmful substances, as well as regulating temperature through mechanisms like sweating and blood flow to the skin. This makes it the correct answer to the question posed.

C) Lymphatic

The lymphatic system helps to defend against infections and maintains fluid balance, but its primary function is not to protect the body from exposure or regulate temperature directly. It plays a supportive role in immune function rather than serving as a barrier.

D) Nervous

The nervous system is responsible for transmitting signals throughout the body to coordinate responses, but it does not directly provide protection from environmental exposure or regulate body temperature. Its role is more about communication and control rather than physical protection.

Conclusion

The integumentary system is the only organ system among the options that directly functions to protect the body from external exposure and assists in regulating temperature. The other systems either serve different primary functions or do not fulfill both criteria outlined in the question. Therefore, option B is definitively the correct answer.