The human respiratory tract is lined with ciliated and mucous-producing cells to

Question

The human respiratory tract is lined with ciliated and mucous-producing cells to help remove any foreign particles in the air we breathe to project our lungs. This is an example of: A) negative feedback. B) homeostasis C) complementarity of structure and function. D) positive feedback E) an essential characteristic of life. When a woman is in labor her uterine contractions get stronger and stronger over time because the stretching uterus sends signals to the brain causing the release of hormones which cause wore muscles to contract and cause them to contract stronger. This is an example of: A) anabolism. B) form follows function. C) positive feedback. D) negative feedback The most common elements found in humans (in order, from highest to lowest percentage by weight) are: A) water, protein, lipids, carbohydrates. B) oxygen, carbon, hydrogen, nitrogen. C) carbon, oxygen, nitrogen, hydrogen. D) oxygen, hydrogen, carbon, nitrogen. The presence of water in our bodies allows us to do all of the following EXCEPT: A) cool the body with sweat because of water's high heat of vaporization. B) maintain a fluctuating body temperature because of water's low heat capacity C) transport many important polar chemicals in body fluids D) keep tissues moist and reduce friction.

Explanation / Answer

1. Molecule-cell-tissue-organ-system

2.acid-substance that capable of donating proton.

So correct ans.is (option .D)

3.ans.(option C). Becuase complementarity of structure and functiin define that function is dependent on structure and structure related according to function.

4.positive feedbck cycle-i.e.an initial disturbance in a system set off a chain of events that incresae the   

Disturbance even further

- does not favour stability and displace system from its steady state operating point

So correct ans.is( option.C)

5.(option.B)..oxygen-65%,carbon-18.5%,hydrogen-9.5%

Nitrogen-3.2%

6.water has large heat capacity which help limit change in

Body temprature in a warm or cold envirinment.

Water help to release heat when ambient temp.is higher than body temp._

So correct ans.is (option.B)

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