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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