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Explain the Rectum and Anal Canal
Rectum: This is a slightly dilated part of the colon. It leads from the pelvic colon.
Anal canal: This is a short canal which leads from the rectum, to the exterior. There are two sphincter muscles which control the anus. The internal sphincter consists of smooth muscle fibre and is under the control of autonomic nervous system. The external sphincter is formed by striated muscle. It is under voluntary nerve control.
Define age related changes in Excretory System There is a progressive decrease in the number and size of nephrons fiasic unit of the kidney). There is a 10% decrease in renal p
Explain Neutral fats Neutral fats are esters of fatty acids with glycerol and found abundantly in nature. These are insoluble in water but readily soluble in ether,
advantages and disadvantages of centralised cataloguing
Use the following procedure for fire fighting. (1) Always take a position between the fire and the exit so your escape route cannot be cut off. Fire extinguishers should always
echinodermata
Explain somatic mutation theory of ageing Random mutation makes the cells inefficient. An increase in the number of mefficient cells in an organ impairs their functioning. Rand
Some Physical Features of the Atmosphere: i) The atmosphere is a mixture of gases. It is made up of 78.08% nitrogen; 21% oxygen by volume. There is only 0.03% of carbon dioxi
Define the term Amplitude In simpler terms, amplitude is the amount or relative value of a signal. Amplitude is measured in units of pressure e.g. Newtons/sq. m. But what is ph
a. A 2 mm diameter parallel beam of photons each with energy of 100 keV is incident on a water phantom of thickness 15 cm. If the exit exposure is 2 mR (caused by primary photons),
describe the factors which decide the broad area of scientific activity
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