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A neuron consists of _____.

dendrites, a cell body, and axons

Nervous tissue functions _____.

to sense stimuli

The four major categories of tissues are _____.

nervous, epithelial, connective, and muscle

As body size increases in animals,

there is a decrease in the surface-to-volume ratio.

To increase the effectiveness of exchange surfaces lining the lungs and the intestines, evolutionary pressures have

increased the exchange surface area with folds and branches.

Tissues are composed of cells, and tissues functioning together make up


Most of the exchange surfaces of multicellular animals are lined with

epithelial tissue.

An example of a connective tissue is the


Connective tissues typically have

relatively few cells and a large amount of extracellular matrix.

Blood is best classified as connective tissue because

its cells are separated from each other by an extracellular matrix.

In a typical nerve cell, the nucleus is found in the

cell body.

All skeletal muscle fibers are both

striated and under voluntary control.

The type of muscle tissue surrounding internal organs, other than the heart, is

smooth muscle.

Food moves along the digestive tract as the result of contractions by

smooth muscle.

Homeostasis is the _____.

maintenance of a relatively constant and optimal internal environment

Negative feedback is a method of homeostatic control that _____.

ensures that conditions in an organism do not vary too much above or below their set points

In a physiological system operating with positive feedback, _____.

a change in a variable will amplify rather than reverse the change

The body’s automatic tendency to maintain a constant and optimal internal environment is termed


An example of a properly functioning homeostatic control system is seen when

the kidneys excrete salt into the urine when dietary salt levels rise.

Positive feedback differs from negative feedback in that

the positive feedback’s effector responses are in the same direction as the initiating stimulus rather than opposite to it.

Compared with a smaller cell, a larger cell of the same shape has

less surface area per unit of volume.

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