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Digestive enzymes and secretions
S.No |
NAME OF THE GLANDS |
PLACE OF ACTION |
ENZYMES/SECRETIONS |
THEIR FUNCTION |
(i) |
salivary gland |
buccal cavity |
salivary amylase |
breaking down starch to simple sugar |
(ii) |
gastric gland |
stomach |
(i) pepsin (ii) hydrochloric acid (ii) mucus |
(i) digestion of protiens (ii) creates an acidic medium which facilitates the action of the enzyme pepsin (iii)protects the inner lining of the stomach from the action of acid in normal conditions |
(iv) |
liver |
duodenum |
bile juice |
(i) acidic food from the stomach (chyme) is made alkaline (ii) emulsifying of fats |
(v) |
pancreas |
duodenum |
pancreatic juice (i) trypsin (ii) lipase |
(i) digesting proteins (ii)breaking down of emulsified fats
|
(vi) |
intestinal glands |
small intestine |
intestinal juice |
converts proteins into amino acids, complex carbohydrates in glucose and fats into fatty acids and glycerol |
|
respiration
the first step is the breakdown of glucose, a six-carbon molecule, into a three-carbon molecule called pyruvate. this process takes place in the cytoplasm. (i) anaerobic:- -anaerobic respiration occurs in the absence of oxygen -it releases lesser energy -it takes place in yeast;- the pyruvate is converted into ethanol and carbon dioxide -in humans, during vigorous
respiration
Inhalation:-when we breathe in, air passes through the trachea, and ribs move up and flatten the diaphragm due to which chest cavity becomes larger. as a result air is sucked and fills the expanded alveoli. exhalation:-ribs move down and the diaphragm becomes dome-shaped decreasing the chest cavity. Thus, pushing the air out of the lungs. **nostrils > nasal passage > pharynx >
larynx > trachea > lungs > bronchi > bronchioles > alveoli > blood > cells**
functioning of excretory system
one end of each nephron as a hollow cup- bowman's capsule. the bowman's capsule has a bundle of blood capillaries called the glomerulus. one end of the glomerulus is attached to the renal artery. the function of the glomerulus is to filter the blood passing through it. only small molecules like glucose, amino acids, salts, urea, and water collected in bowman's capsule are the filtrate. the filtrate collects in the collecting duct of the kidneys from where it is carried to the ureter .urter then passes this filtrate to the urinary bladder from where urine is ultimately passed out |
|
|
heart
Pulmonary circulation:- the movement of blood from the heart to lungs and back to heart constitutes pulmonary circulation **Systematic circulation:- the movement of blood from the heart to various places of the body expect lungs and back to the heart
|
|
amoeba
amoeba takes in food using temporary finger-like extensions of the cell surface which fuse over the food particle forming a food vacuole. inside the food, vacuole complex substances are converted to simpler ones which then diffuse into cytoplasm
|
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