GENERAL HISTOLOGY

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CONNECTIVE TISSUE GLAND

ENDOCRINE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
When levels go above or below a set point a hormone is released to return the body to set point. When the body is restored to set point no more hormone is released. This is an example of ____
A
a positive feedback loop
B
a negative feedback loop
C
a neutral feedback loop
D
None of the above
Explanation: 

Detailed explanation-1: -Insulin and glucagon are the two hormones primarily responsible for maintaining homeostasis of blood glucose levels. Additional regulation is mediated by the thyroid hormones.

Detailed explanation-2: -The effector is an organ, gland, muscle, or other structure that acts on the signal from the control center to move the variable back toward the set point.

Detailed explanation-3: -If heat loss is severe, the brain triggers an increase in random signals to skeletal muscles, causing them to contract and producing shivering. The muscle contractions of shivering release heat while using up ATP.

Detailed explanation-4: -When body temperature rises, the hypothalamus initiates several physiological responses to decrease heat production and lose heat: Widening of surface blood vessels (vasodilation) increases the flow of heat to the skin and get flushed. Sweat glands release water (sweat) and evaporation cools the skin.

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