Interferons are a series of proteins that help other defense systems fight pathogens by harming their plasma membrane.

The _______________ are the largest of vessels. They have lots of elastic fibers in the tunica media giving them the ability to stretch in response to the huge volume of blood being forced into these vessels as a result of ventricular systole. When the ventricles relax, these vessels will then recoil back to their original diameter.

Vaccination is an example of:

Respiration rates are mainly controlled by the medulla oblongata and:

___________________ are a type of __________________ that is activated (under costimulation) to produce and release antibodies into the lymph. (Choose all that apply; no partial credit)

Tubular secretion in the nephron is a process by which substances move ________.

Tubular secretion in the nephron is a process by which substances move ________.

The complement system is composed of a number of inactive proteins found in the plasma and on the plasma membranes of cells. When activated these proteins have three primary roles. In this context chemotaxis is the:

Determine if the underlined portion of the statement is true or false. As vaccination rates have dropped, so has the incidence of autism.

The exchange of gases that occurs during external respiration takes place in the: