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Question

Fill in the blanks.

(i) The blood from the heart is transported to all parts of the body by the______.

(ii) Haemoglobin is 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 ______.

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Solution

(i)The blood from the heart is transported to all parts of the body by the _arteries__.

Arteries transport blood from the heart to the body tissues. Veins carry blood back to the heart.

(ii)Hemoglobin is in __red blood__ cells.

Hemoglobin is the protein inside red blood cells. It carries oxygen.

(iii)Arteries and veins are joined by a network of __capillaries__.

Capillaries, the smallest and most numerous of the blood vessels, form the connection between the vessels that carry blood away from the heart (arteries) and the vessels that return blood to the heart (veins). The primary function of capillaries is the exchange of materials between the blood and tissue cells.

(iv)The rhythmic expansion and contraction of the heart is called__cardiac cycle_.

Contraction is denoted as cardiac systole. Further Relaxation is denoted as cardiac diastole. Contraction and relaxation are stated as the cardiac cycle.The heart beats 72 times per minute in an individual human body.

(v)The main excretory product in human beings is __urea__.

Excretion of urea is known as ureotelism. Mammals, many terrestrial amphibians, and marine fishes mainly excrete urea and are called ureotelic animals.

(vi)Sweat contains water and __salts__.

The sweat produced by sweat glands Is a watery fluid containing NaCI, small amounts of urea, amino acids and glucose etc

(vii)Kidneys eliminate the waste materials in the liquid form called__urine__.

Urine is a liquid waste by-product of the body that the kidneys have secreted into a process called urination and excreted via the urethra.

(viii)Water reaches great heights in the trees because of suction pull caused by __transpiration__.

This loss of water from the stomata/aerial part of the plants is known as transpiration.This generated a suction pull, which can pull the water upward from the xylem cell of the root to the leaves.


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