Where does the process of chemical digestion begin?

Water is extracted from digested food in the body primarily by the

The function of the excretory system is to help maintain homeostasis by

What passage carries food between the pharynx and the stomach?

The stomach breaks down food into a soft, partially mixture called

The main organs of the excretory system are the

A circulating fluid called __________ is pumped through a system of vessels in the body.

A slight scratch of the skin does not cause bleeding because the epidermis lacks ______________.

The iron-containing protein called ______________ binds to oxygen in the lungs and transports it to tissues throughout the body, where the oxygen is released.

Breathing is such an important function that your ___________ system will not let you have complete control over it.

The functional units of the kidneys are the _____________.

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