Which organ systems are used to the body shiver?
a.) circulatory and respiratory
b.) nervous and muscular
c.) circulatory and muscular
d.) respiratory and nervous

The correct answer is option B

The temperature of the body is maintained by the certain actions that the body does in extreme conditions to maintain the temperature about 98.6°F.

If the body is in chilling conditions then there are chances that the body will be in hypothermia condition and to control the temperature the brain gives the signals to the muscles of the body to contract and expand very speedly.

When the surface of the body gets too chilly then the skin receptors sends the signals to the brain which gives signals to the muscles to shiver and in extreme case the chattering of teeth also takes place.

golgi body just took the test on edge

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!