The forward movement of food by muscle constriction is called __________.

The digestive tract have several ways of increasing absorptive surfaces. They include:

Which of the following carry venous blood?

Match each of the below with its correct answer.

The basic unit of the nervous system is called __________.

Osteoclasts resorb calcium, whereas osteoblasts absorb calcium.

Cerebrospinal fluid is made by the __________.

Which of the following help in the return of venous blood to the heart?

These are threads attached to atrioventricular valves.

Osteoclasts resorb calcium, whereas osteoblasts absorb calcium.