Describe TWO facts about enzymes.

Describe a condyle and a foramen.

Name the directional term labeled “B”

Name and describe THREE functions of the skin.

Positive feedback loop:

Explain TWO of the functions of ATP in muscles.

Briefly explain the action: “extension of the knee”.

Blood calcium levels are maintained through negative feedback loops. Describe what the body does to reverse a decrease in blood calcium levels (i.e., to increase blood calcium levels). Be sure to include all relevant cells, structures, organs, hormones, etc.

Osteocyte:

Describe the action known as “adduction of the arm”.