Thin cell covering that hols the parts of the cell together.

Movement of water and dissolved materials through the cell membrane.

Some kinds of nerve cells, called ________, detect conditions in the body's environment.

Tough bands of tissue called __________ attach the bones to the muscles.

Basic unit of structure and function of living things.

Oxygen enters the body through the _________

An animal's skin is an example of ___________

Jellylike substance that contains many chemicals to keep the cell functioning.

Cells that work together to perform a specific function.

The circulatory system transports blood through vessels called arteries, veins, and ________

Oxygen travels to every cell in the body through the ________________

Organelle that determines the cells activities.

Organs that work together to perform a function

Bones are attached to each other in places called ____________.

Nutrients move from the digestive system into the blood by traveling through ______________, tiny tubes sticking out of the wall of the small intestine.

Tissues that work together

Plants and animals grow when cells ____________.

Specialized cells called ________________ transmit and receive nervous-system signals.

Process by which particles of a substance move from an area where there are many particles of the substance to an area where there are fewer particles of the substance.

In the body's excretory system, urea and water travel from the blood into the kidneys and diffuse into _________.

The hip is an example of what kind of joint?

Osmosis is one kind of __________.

Other bands of tissue called _________, attach the bones to each other.

Bones have a hard outer membrane and a soft center that contains ___________. Which is connective tissue that produces red and white blood cells.

In the respiratory system, air travels into and out of the lungs through tubes. The smallest tubes end in tiny sacs called __________.