AP BIOLOGY

LABORATORY REVIEW

MOLECULAR BIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
When a person is extremely cold, his or her muscles will use energy to spasm and generate heat, the act of shivering. Which conclusion best explains why the body does this?
A
The body maintains homeostasis by keeping the body at a specific temperature.
B
The body tricks the mind into thinking it is not cold so that it can maintain homeostasis.
C
The body maintains homeostasis by releasing water to maintain the muscles’ temperature.
D
The body loses mass through shivering so that it can better maintain homeostasis.
Explanation: 

Detailed explanation-1: -When the hypothalamus senses that you’re too cold, it sends signals to your muscles that make your shiver and create warmth. This is called maintaining homeostasis. The hypothalamus also maintains homeostasis in lots of other ways, such as by controlling your blood pressure.

Detailed explanation-2: -Thermogenesis: Your body’s muscles, organs, and brain produce heat in various ways. For example, muscles can produce heat by shivering. Hormonal thermogenesis: Your thyroid gland releases hormones to increase your metabolism.

Detailed explanation-3: -Negative feedback loops, which tend to keep a system at equilibrium, are more common than positive feedback loops. Pyrogens increase body temperature by causing the blood vessels to constrict, inducing shivering, and stopping sweat glands from secreting fluid.

Detailed explanation-4: -Shivering-nerve impulses are sent by the hypothalamus to the skeletal muscles to bring about rapid contractions that generate heat. Shivering therefore helps raise the body temperature. Increase in metabolic rate-the liver produces extra heat in order to raise the temperature of the body.

There is 1 question to complete.