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Test 5

B) is the maintenance of a constant internal state.

1) Homeostasis

2) Which of the following is most likely to be responsible if, when your blood sugar level rose, the level went back down?

C) a homeostatic mechanism based on negative feedback

3) Which of the following cell types initiates a secondary immune response?

B) memory cells

4) Which of the following, produced by virus-infected cells, diffuses to neighboring cells to help them fight a viral infection?

A) interferon

5) Which of the following is one of the body's innate defenses against infection?

A) barriers such as dead skin cells and mucus

6) The two main functions of the lymphatic system are

E) returning tissue fluid to the circulatory system and fighting infections.

7) A substance or pathogen that can elicit an immune response is called a(n)

B) antigen

8) Which of the following classes of compounds is not used as a hormone?

A) carbohydrates

A) metabolism.
B) reproduction.
C) water balance.
D) growth.
****E) All of the choices are correct

9) Hormones regulate

10) Which of the following is associated with obesity, often does not show up until after the age of 40, and occurs because cells of the body fail to respond adequately to insulin?

A) type II diabetes

11) The autonomic nervous system

A) regulates the internal environment of the body.

12) The two physical divisions of the nervous system are the

C) CNS and PNS

13) What part of a nerve cell carries signals toward the part of the cell that houses the nucleus?

C) dendrite

14) Compared to the endocrine system, the nervous system

A) has a faster response but the signal does not last as long.

15) In a chemical synapse, what is the name of the gap between the transmitting and receiving neurons?

D) synaptic cleft

16) Which of the following effects could result from activation of the sympathetic nervous system?

C) decreased rate of digestion

17) Which of the following is NOT an action of the parasympathetic nervous system?

D) release of glucose from the liver

18) At a chemical synapse, what causes the ion channels on the receiving cell's membrane to close?

D) The neurotransmitter is broken down by an enzyme.

19) If the head of a venomous snake is removed it can still strike if its body is contacted. This is an example of

B) An arc reflex (motor response)

20) When a nerve sends a signal to another nerve, it always stimulates the second nerve to fire.

B) False

21) This induces production of a specific antibody.

B) antigen

22) Which hormone increases as blood Calcium rises?

E) Calcitonin

23) Which is a functional division of the peripheral nervous system?

A) Somatic nervous system

24) Which of the below helps form, and produces the hormone that promotes maturation of T cells?

D) thymus

25) Which of these does not provide a physical or chemical barrier of immunity?

A) macrophages

26) Which of the below induces vasodilatation and permeability (increased fluid flow) to an infection site?

A) histamine

27) This can only become activated when encountering a foreign antigen (non-self) and a self complex simultaneously.

B) Helper T Cell

28) A natural exposure to an infectious agent leads to:

B) active immunity

29) Which of the following brain regions controls the secretion of pituitary hormones and exerts direct control over many other aspects of homeostasis?

C) hypothalamus

30) Which hormone promotes an increased metabolic rate?

D) thyroid hormone (thyroxine)

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