When a woman is giving birth, the head of the baby pushes against her cervix and stimulates release of the hormone oxytocin. Oxytocin travels in the blood and stimulates the uterus to contract. Labor contractions become more and more intense until the baby is expelled. This is an example of _______. The stimulus that initiates the cycle is _______.

Refer to the diagram above (FIG.21). Name the structure labeled # 3.

Refer to the above diagram (FIG.6.) The membrane protein in the transport “3” represents ________. It transports solutes _______ their concentration gradients.

________ is explained by chemical and physical principles and is concerned with the function of specific organs or organic systems.

Refer to the diagram above (FIG.12). What does “2” represent?

The ___________ belongs to the thoracic cage, whereas the ___________ belongs to the pectoral girdle.

Refer to the CNS diagram above (FIG.18). __________ is labeled “B”. Its major function is involved in ___________.

Refer to the above diagram (FIG.7.) In the above diagram, layer “1″ consists of ______, whereas layer “2” consists of_______.

Refer to the diagram above (FIG.16). What does “3” represent?

Catalysts can _______ the rate of a chemical reaction by _______ the activation energy. Catalysts are _______ during the reaction.