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Fed [463]
3 years ago
9

The _______ system helps guard against infection, protect from UV radiation, and regulate body temperature? A. integumentary B.

immune C. circulatory D. endocrine
Biology
2 answers:
KiRa [710]3 years ago
6 0

Correct answer: A). Integumentary

The integumentary system composed of the hair, nails, skin, glands, and nerves. Its main function is to provide protection to the body against disease-causing infections such as bacteria and viruses and act as a barrier to harmful ultraviolet radiations, which are coming from the Sun.

It works in coordination with all the other system of the body in order to maintain internal body temperature which is essential for normal body functions. It also helps the body to eliminate waste products.

Hence the correct answer would be option A.


Molodets [167]3 years ago
5 0

The immune system helps guard against infection, protect from UV radiation, and regulate body temperature.

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Hormone production and release are primarily controlled by negative feedback. In negative feedback systems, a stimulus elicits the release of a substance; once the substance reaches a certain level, it sends a signal that stops further release of the substance. In this way, the concentration of hormones in blood is maintained within a narrow range. For example, the anterior pituitary signals the thyroid to release thyroid hormones. Increasing levels of these hormones in the blood then give feedback to the hypothalamus and anterior pituitary to inhibit further signaling to the thyroid gland, as illustrated in Figure 18.14. There are three mechanisms by which endocrine glands are stimulated to synthesize and release hormones: humoral stimuli, hormonal stimuli, and neural stimuli.

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Hormonal stimuli refers to the release of a hormone in response to another hormone. A number of endocrine glands release hormones when stimulated by hormones released by other endocrine glands. For example, the hypothalamus produces hormones that stimulate the anterior portion of the pituitary gland. The anterior pituitary in turn releases hormones that regulate hormone production by other endocrine glands. The anterior pituitary releases the thyroid-stimulating hormone, which then stimulates the thyroid gland to produce the hormones T3 and T4. As blood concentrations of T3 and T4 rise, they inhibit both the pituitary and the hypothalamus in a negative feedback loop.

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