Question 1

Homeostasis involves three parts namely: the receptor, the control canter and effector. The following statement describes correctly how these parts work to ensure homeostasis.*

A. The effector  receives information that something in the environment is changing, then the control center or integration center receives and processes information from it and lastly, the receptor responds to the commands of the control center by either opposing or enhancing the stimulus

B. The control center or integration center receives and processes information from the receptor and lastly, the effector responds to the commands of the control center by either opposing or enhancing the stimulus

C. The receptor receives information that something in the environment is changing, then the control center receives and processes information from the receptor and lastly, the effector responds to the commands of the control center by either opposing or enhancing the stimulus.

Question 2

The following statements apply to positive feedback loop EXCEPT:*

A. It involves a response that reinforces the change detected

B. It continues to amplify the initial change until the stimulus is removed.

C. It involves a reaction in which the system responds in such a way as to reverse the direction of change.

D. It is less common in occurrence, but it has its applications.

Question 3

Negative feedback loop can be involved in the following situations EXCEPT:*

A. Ovulation

B. Hyperglycemia

C. Blood clotting

Question 4

Select the phrase(s) below that best describe(s) homeostasis:*

A. Fluctuating within a homeostatic range

B. Maintaining a constant internal environment

C. Dynamic equilibrium

D. Deviating

Question 5

In response to a bacterial infection my body's thermostat is raised. I start to shiver and produce more body heat. When my body temperature reaches 37 degrees, I stop shivering and my body temperature stops going up. This is an example of:*

A. Negative feedback

B. A malfunctioning control system

C. Positive feedback

D. A negative impact

Question 6

The following is an example of a positive feedback:*

A. Shivering to warm up when the weather is cold

B. You sweat on a hot summer's day and the blood vessels in your skin vasodilate

C. You get cut and platelets form a clot. This in turn activates the fibrin clotting system and more blood forms clots

Question 7

The removal of part of the liver leads to the regeneration of the remaining liver cells (hepatocytes) to compensate for the loss. Even with removal of 70% of the liver, regeneration is complete in about 2 weeks. This is an example of :*

A. Pathologic hyperplasia

B. Hypertrophy

C. Physiologic hyperplasia

D. Physiologic atrophy

Question 8

The single most common cause of cellular injury is :*

A. Free radicals

B. Chemicals

C. Hypoxia

D. Infection

Question 9

Once a cell is injured, it is always irreversible:*

A. True

B. False

Question 10

The cell may adapt by a reversible replacement of one mature cell by another, sometimes less differentiated, cell type .This is known as :*

A. Atrophy

B. Hypertrophy

C. Dysplasia

D. Metaplasia

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