Question 28

Label the following parts in Figure 2.2 and name them.

(a) The largest gland in our body.

(b) The organ where protein digestion starts.

(c) The organ that releases digestive juice into the small intestine.

(d) The organ where bile juice is stored.

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Solution

(a) The liver is the largest gland in the human body. The liver is located at the upper part of the abdomen in the right side. It is reddish brown in colour and secretes bile. The bile juice helps in the digestion of fat.

(b) The stomach releases hydrochloric acid and digestive juices which acts on food. The digestive juices break down the proteins into proteins simpler substances. The stomach is the widest part of the alimentary canal. It is a thick-walled bag and has a flattened U shape. It secretes mucous, hydrochloric acid and digestive juices.

(c) The pancreas releases digestive juice into the small intestine. It is a large cream coloured gland located just below the stomach. The pancreatic juice acts on carbohydrates and proteins and changes them into simpler forms.

(d) The bile secreted by the liver is stored in a sac called the gall bladder. It temporarily stores bile. The bile helps in the digestion of fats.

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Q. Read the following passage carefully and answer the questions that follow it. Bile juice is stored in a sac called, gallbladder, located near its organ of secretion, the liver. The gallbladder releases the bile juice into the small intestine whenever food reaches there. Though bile juice is devoid of any digestive enzymes, it is required for the digestion of fats. The fats cannot be digested easily because they are insoluble in water and are present as large globules. Bile juice breaks down big fat droplets into smaller droplets. These are then easily digested by the enzymes released from the pancreas.

(a) Which organ secretes the bile juice?
(b) Why is digestion of fats difficult as compared to that of other nutrients?
(c) How does bile juice help in the digestion of fat?
(d) Where is the digestion of fat completed?
(e) Does bile juice digest fat completely?

Question 27
Read the following passage carefully and answer the questions that follows it.

Bile juice is stored in a sac called the gall bladder, located near its organ of secretion that is the liver. The gall bladder releases the bile juice into the small intestine whenever food reaches there. Though bile juice is devoid of any digestive enzymes, it is required for the digestion of fats. The fats cannot be digested easily because they are insoluble in water and are present as large globules. Bile juice breaks down big fat droplets into smaller droplets. These are then easily digested by the enzymes released by the pancreas.

(a) Which organ secretes the bile juice?

(b) Why is digestion of fats difficult as compared to that of other nutrients?

(d) Where is the digestion of fat completed?

(e) Does bile juice digest fat completely?

Match the following :

(a)	Digestive organs	Shape of digestive organs
	Stomach	Coil-like part
	Small intestine	Part with bulges on the outside
	Large intestine	Bag-like part
(b)	Digestive organ	Digestive juice
	Small intestine	Bile
	Liver	Pancreatic juice
	Pancreas	Intestinal juice

Write the answers:

(a) Name some organ systems in the human body.

(b) Name the organs of the digestive system.

(d) Name the juices which help to digest food in the small intestine.

(e) Which organs help in the function of respiration?

Q. Find out the correct match of the organ, its enzymes and its function.

Organ	Enzymes	Functions
Liver	Lipases	Help in emulsification of fats, along with bile salts
Acini of pancreas	Amylopsin (pancreatic juice)	Digestion of animal starch into maltose
Stomach	Renin (in gastric juice)	Converts caesin into paracraesin i.e curdling of milk
small	Dipeptides (in succus entericus)	Creates end products of protein digestion

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Small Intestine

Standard VII Biology

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Question 28 Label the following parts in Figure 2.2 and name them. (a) The largest gland in our body. (b) The organ where protein digestion starts. (c) The organ that releases digestive juice into the small intestine. (d) The organ where bile juice is stored.

Question 28

Label the following parts in Figure 2.2 and name them.

(a) The largest gland in our body.

(b) The organ where protein digestion starts.

(c) The organ that releases digestive juice into the small intestine.

(d) The organ where bile juice is stored.