The post Homeostasis : Control, Feedback System, Homeostatic Imbalance and MCQs for NEET, GPAT, CSIR NET JRF appeared first on Gpatindia: Pharmacy Jobs, Admissions, Scholarships, Conference,Grants, Exam Alerts.
]]>” The mechanism by which the constancy of the internal environment is maintained and ensured is called the homeostasis.”
1.] Homeostasis is an dynamic condition.
2.] Each structure, from the cellular level to the systemic level, contributes in some way to keeping the internal environment of the body within the normal limits.
CONTROL OF HOMEOSTASIS :-
1.] Homeostasis in the human body is continually being distributed sometimes from the external environment in the form of physical insults such as intense heat.
2.] Other disruptions originates in the internal environment, such as blood glucose level that falls too low when you skip breakfast.
3.] In most cases the disruption of homeostasis is mild and temporary, and the responses of body cells quickly restores balance in the internal environment.
FEEDBACK SYSTEM :-
” A feedback system or feedback loop is a cycle of events in which the status of a body condition is monitored, evaluated, changed, remonitored, reevaluated and so on.”
1.] The body can regulate its internal environment through many feedback systems.
2.] A feedback system includes three basic components :-
3.] In a feedback system the response of the system “feed back” information to change the controlled condition in some way, either negating it (negative feedback) or enhancing it (positive feedback).
A.] NEGATIVE FEEDBACK SYSTEM : A negative feedback system reverses a changes in a controlled condition.
B.] POSITIVE FEEDBACK SYSTEM : A positive feedback system tends to strengthen or reinforce a change in one of the body’s controlled condition.
HOMEOSTATIC IMBALANCE :-
MULTIPLE CHOICE QUESTIONS [MCQs] :-
1.] Which of the following statement best describe the homeostasis ?
a. Keeping the body in a fixed or unaltered state
b. Dynamic equilibrium
c. Maintaining a near – constant internal environment
d. Altering the external environment to accommodate the body needs
2.] Which of the following feature of a system is unlikely to lead to a stable homeostatic system ?
a. Negative feedback
b. Positive feedback
c. Redundancy
d. Complexity
3.] Which of the following strategies would not help restore a high body temperature to normal?
a. Non – shivering thermogenesis
b. Sweating
c. Flattening of skin hair
d. Redistribution of blood flow to the periphery
4.] Which of the following hormone is not important in calcium homeostasis ?
a. Calcitonin
b. Parathyroid hormone
c. 1 , 25 – dihydroxycholecalciferol
d. Glucagon
5.] Which of the following word means a change in environment ?
a. Neuron
b. Reflex
c. Stimulus
d. None of the above
6.] Give two examples of effector. Select the two correct answers ?
a. Glands
b. Muscles
c. Neurons
d. Synapse
7.] Which of the following is not a homeostatic mechanism ?
a. Hormonal regulation
b. Thermoregulation
c. Oxygen regulation
d. Water regulation
8.] Homeostasis is classified under which of the following ?
a. Transcription
b. Cell regulation
c. Cell respiration
d. Photosynthesis
9.] Helps maintain cellular homeostasis by modifying, sorting and packaging protein to transport ?
a. Nucleus
b. Golgi apparatus
c. Endoplasmic reticulum
d. Cell membrane
10.] The secretion of hormone is an example of homeostatic feedback loop. The basic function of a feedback loop is to ?
a. Regulate a process
b. Create substance
c. End the process
d. Destroy substance
SOLUTIONS :-
1.] (c) Maintaining a near – constant internal environment
2.] (b) Positive feedback
3.] (a) Non – shivering thermogenesis
4.] (d) Glucagon
5.] (c) Stimulus
6.] (a) and (b) Glands and Muscles
7.] (a) Hormonal regulation
8.] (b) Cell regulation
9.] (b) Golgi apparatus
10.] (a) Regulate a process
REFERENCES :-
1.] Textbook Of Pathology By Harsh Mohan; 7th edition; Page no. 78
2.] Gerard J Tortora- Principles of Anatomy and Physiology; 12th edition; page no. 8 – 11
The post Homeostasis : Control, Feedback System, Homeostatic Imbalance and MCQs for NEET, GPAT, CSIR NET JRF appeared first on Gpatindia: Pharmacy Jobs, Admissions, Scholarships, Conference,Grants, Exam Alerts.
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