Q. 24.6( 94 Votes )

Fill in the blanks.

i. The blood from the heart is transported to all parts of the body by the _________.

ii. Hemoglobin in present in ______ cells.

iii. Arteries and veins are joined by a network of _____.

iv. The rhythmic expansion and contraction of the heart is called_____.

v. The main excretory product in human beings is ______.

vi. Sweat contains water and ________.

vii. Kidneys eliminate the waste materials in the liquid form called______.

viii. Water reaches great heights in the trees because of suction pull caused by _______.

Answer :

i. Arteries.

These are thick blood vessel which transport blood from heart to all parts of the body.

ii. red blood.

Red blood cells(RBC) contain a red pigment called hemoglobin. Hemoglobin bind with oxygen and transports it to all the parts of the body and ultimately to all the cells.

iii. Capillaries.

Arteries and veins are joined by a network of capillaries.

iv. Heartbeat.

One complete contraction and relaxation of the heart is called a heart-beat. The usual heart beat rate at rest is 72 times /minute.)

v. urea

Urea is the main excretory product in human beings. The urine consists of 95% water and 2.5% urea

vi. Salts.

Sweat contain water and salts.

vii. Urine.

An adult human being normally passes about 1–1.8 L of urine in 24 hours, and the urine consists of 95% water, 2.5 % urea and 2.5% other waste products.

viii. Transpiration.

The evaporation of water from the leaves of the plants is called transpiration.

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