Fat exists in the human body in two primary locations. First there is subcutaneous fat, which can be thought of as a layer of fat located _______; second there is visceral fat, which is fat that surrounds _______ deep within the _______.

Each hair that we have grows out of a tissue complex called a _______.

Going from least inclusive to most inclusive, how would the following levels of organization be ordered in a human being: organ system, cell, tissue, organ?

What are the four basic tissue types in a human being?

_______tissue is specialized in its ability to contract, while _______ tissue is specialized in its ability to conduct electrical impulses.

The study of where the component parts of the body are located and how they are structured is called _______, while the study of how the component parts of the body work is called ______.

Negative feedback occurs when the elements that bring about a response have their activity _______ by that response.

Negative feedback is important because it preserves homeostasis in the body, meaning a _______ internal state.

Cells called melanocytes that lie deep in the epidermis produce a pigment, called melanin, that gives skin its color. Exposure to ultraviolet light—from the sun or a tanning bed—causes melanocytes to produce more melanin, which they pass along to the skin cells above them, yielding a suntan. But why would sun exposure prompt this increased melanin production? What is the function of a tan, in other words?

To survive, the human body needs to maintain ________ and does so primarily through the means of self-regulation known as ______.

a. high energy output; positive feedback

b. adequate fat layers; exocrine secretion

c. bone density; muscle contraction

d. homeostasis; negative feedback

e. nerve signal transmission; hormonal secretion