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.

Human obtain Vitamin D from:

Via the __________ division of the peripheral nervous system (PNS), motor commands are sent from the CNS to muscles and glands.

The __________ has C-shaped cartilages in its wall.