Excretory System

Question 1

What happens if useless unwanted substances are retained in the body?

Answer 1

If we retain’t in the body, these useless unwanted substances may become poisonous and cuase much harm and in severe cases even death.

Question 2

What are excretory organs?

Answer 2

Organs which remove unwanted toxic substances from the body are called excretary organs.

Question 3

_______is the structural and functional unit ofkidney

Question 4

Name the substances to be excreted

Answer 4

1. urea and uric Acid
   2.Bile Pigments
   3.water
   4.extra salts
   5.extra vitamins

Question 5

Explain the following
1.Urea and uric acid

Answer 5

U Rea and eric acid - are also called nitrogenous wastes . these are produced as result of the breakdown of excessive, amino acids in the liver. If allowed to accumulate inthe body these are harmfull.

Question 6

2. Bile Pigments

Answer 6

These are formed in the liver. They give a yellowish tange to the Urine.Excess of bile Pigments become harmful / hence they are removed from the body.

Question 7

3. Water

Answer 7

Water is taken in with food & Beverages in large quantities . Plenty of water is the body is essential for “Washing Out” of the nitrogenous wastes. Thebody retains some water required as a normal constituent while the ex ce ss water is removed from the body in different ways .

Question 8

4. Extra Salts

Answer 8

Suchas the common factor (Nacl) . Sodium Chloride ions or anyother ions
only are needed i n the body only in certain Proportions .Any extra quantity mustbe removed . Extra salts are expelled along with urine

Question 9

5. Extra vitamins

Answer 9

The Vitamins absorbed from the foodmaybe in excess The fat Soluble one are storedin the body some to exert , but the extra watersoluble one such as ortamin B &C are passed out in arine . Similarly certain medicins including antibiotics, it taken in extra quantity are passed out along with urine.

Question 10

what is the excretory systeron also called and what are the 5 things that it consists of in humane .

Answer 10

renal excretory systan; consists of a pair of kidneys ‘ 2 ureters , a urinary bladder and a urethra .

Question 11

Write abt the foll:

Answer 11

. . .

Question 12

1. kidneys

Answer 12

The two reddish brown bean shaped kidneys r situated towards the back of the abdomen one on either side of the backbone at one either Side of the ba CK bone at the level of the last2 ribs 1 The right Kidney is located slightely lower than the left one .

Question 13

2. ureters

Answer 13

A narrow take called the writer runs from the iner sides of the each kidney up to the urinary bladder

Question 14

3. Urinary Bladder

Answer 14

It isa muscular bag situated in the lower abdomen.

Question 15

4. urethra

Answer 15

Leading from the urinary bladder is a Single medurm tube called the withra . opening to the Outside It is longer in malls and shorter in females.

Question 16

Explain the structure of kidney

Answer 16

Internally each kidney is composed If anouter darker region called CORTEX . and an inner lighter region called MEDULLA . the Medulla drainsthe Urine into a funnel shaped trusture called the RENAL PELVIS . the ureters originate from here.

Question 17

What are Nephrons?

Answer 17

Inside the kidneys are
millions of tubules structures called RENAL TUBLES or NEPH RONS . each nephrops Starts as a cup like BOWMANS CAPSULE which continues behind as a narroww tubule .Thetubule is conveluted & open’s into a collective duct . All the coveluting ducts then open in the renal pelvis which leads into the ureter.

Question 18

What does a human urine mainly consist of ?

Answer 18

A normal human urine mainly consist of Water . Urea , uric acid & some amnt of mineral salts.