Oxytocin release stimulates uterine contractions, which stretches the cervix. Cervix stretching stimulates the posterior pituitary gland to secrete more oxytocin, which stimulates more uterine contractions. This is an example of:

Which of the following reduces surface tension in the alveoli:

The humerus is an example of a(n) _____ bone.

Which granulocyte helps protect against infections caused by parasites?

Which granulocyte secretes the chemical histamine?

Match each structure in the heart with its corresponding description or function.

Which of these are bone-resorbing cells?

A nerve is

A nerve is

Match each disorder of the circulatory system with its definition or description.