1. Which of the following is NOT a true statement regarding the factors needed f
ID: 3520305 • Letter: 1
Question
1. Which of the following is NOT a true statement regarding the factors needed for survival?
A. Because water is plentiful in the body (60 – 80%), it is the leasti mportant survival need
B. The nutrients that provide the energy and building blocks needed for cell growth and repair
C. If body temperature drops too low, metabolism will slow down
D. Atmospheric pressure is important for breathing
E. The body needs glucose as its primary source of energy
2.. Which of the following characteristics of an axon is most dependent on its diameter?
A. Its resting potential
B. The duration of its action potential
C. The conduction velocity of its action potential
D. The overshoot of its action potential
E. The activity of its sodium-potassium pump
Explanation / Answer
1. The answer is option A
Exp: Water is one of the most essential parts of the body. Slight fall in the body water volume leads to activation of body fluid homeostatic mechanism to ensure prevention of further fluid loss. Adequate body water content keeps the body enzyme working and keeps blood volumes normal to deliver an adequate amount of oxygen to vital organs like the brain. If there is fall in body water content it eventually will lead to shock. Water also takes vital role in thermoregulation of body too.
Other option:
Option B is correct all of you know that.
Option C: if body temperature falls too low, the body enzymes which maintains metabolism gets deactivated. Each enzyme has a temperature range for their activity. Temperature above rang and bellow that range makes that enzyme inactive--> so too low body temperature cause enzyme inactivation and low meabolic rate.
Option d: atmospheric pressure is important for breathing. As you already know that in hilly area where atmospheric pressure is low, respiratory rate is higher.
Option e: Glucos e is indeed is the primary source of energy, and it is evident from the incident that hypoglycaemia can cause fainting.
2. Answer is:C
In experiment is is proven that the conduction velocity of neurone is proportional to the diameter of the neurone axone.
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