The mechanisms of homeostasis

• Keep the internal physiological environment relatively constant regardless of external changes

• Keep vital organs working at their maximum potential

• Keep all cells working at the same metabolic rate

• None of the above

A mouse has been eating your supply of snacks, so you set a trap and wait to hear the 'snap!' indicating that it has been caught. Your ears are providing

• Positive feedback

• An error signal

• Negative feedback

• feedback

In regulatory systems, negative feedback

• Amplifies a response

• stimulates a return toward the set point

• is the least common type of feedback mechanisms

• disrupts homeostasis

Which of the following statements about positive feedback is FALSE?

• Contractions of the uterus are an example of positive feedback.

• It is more commonly observed than negative feedback.

• It tends to reach a limit and terminate rapidly.

• It amplifies the response

Which of the following would serve to change the set point of a regulatory system?

• negative feedback

• positive feedback

• feed-forward feedback

• error signal

Which of the following statements about tissues is FALSE?

• Adipose tissue is a form of connective tissue

• The protein elastin is found in tissues that are regularly stretched

• An organ is usually composed of single type of tissue

• Epithelial tissue forms a boundary between the inside and outside of the body

Which type of tissue is responsible for secreting digestive enzymes?

• epithelial

• muscle

• nervous

• connective

While working in a laboratory, you are shown a slide containing animal tissue composed of long cells that have a regular array of cross-striations of actin and myosin. The nuclei of the cells are pressed up against the sides of the cells. You are told this is an abundant tissue type in the body. What is the function of this tissue?

• generating forces and causing movement

• carrying oxygen throughout the body

• thermoreduction

• conducting nerve impulses

Blood is a type of _________ tissue

• epithelial

• muscle

• nervous

• connective

One function of adipose tissue is to

• provide thermoregulation

• provide support against gravity

• transmit electrical signals to the central nervous system

• Transport oxygen