31) What is/are the primary function(s) of the skeletal system?

A) protection from environment

B) internal transport of materials

C) support, protection, and mineral storage

D) delivery of air for gas exchange

E) locomotion and heat production

32) Which organ system is labeled #1?

A) nervous system

B) reproductive system

C) integumentary system

D) lymphatic system

E) muscular system

33) What is(are) the function(s) of the organ system labeled #3?

A) help control body temperature

B) provides support; produces heat

C) provides support; protects tissues; stores minerals

D) directs immediate responses to stimuli

E) defends against infection and disease

34) Lungs are to the respiratory system as the spleen is to the

A) lymphatic system.

B) urinary system.

C) digestive system.

D) cardiovascular system.

E) muscular system.

35) A structure that senses change is called a(n) ________.

A) stimulus

B) receptor

C) effector

D) integration center

E) control center

36) The tendency for physiological systems to stabilize internal conditions with respect to the external environment is called ________.

A) integration

B) internal regulation

C) responsiveness

D) homeostasis

E) external regulation

37) Which component of a homeostatic regulation is characterized by activity that opposes or enhances the stimulus?

A) balance

B) control center

C) integration center

D) positive feedback loop

E) effector

38) It’s the middle of winter and a typically healthy person starts to exit a building without a coat, but re-enters the building to retrieve her coat. This regulation mechanism is an example of

A) negative feedback.

B) positive feedback.

C) homeostatic regulation.

D) diagnostic regulation.

E) a behavioral change and is not related to the internal environment.

39) The prevention of change, by ignoring minor variations and maintaining a normal range rather than a fixed value, is characteristic of

A) positive feedback.

B) stimulus reinforcement.

C) negative feedback.

D) effector control.

E) both positive and negative feedback loops.

40) The increasingly forceful labor contractions that lead to childbirth are an example of which type of mechanism?

A) receptor activation

B) effector shutdown

C) negative feedback

D) positive feedback

E) thermoregulation