Blood is never stationary in the body.

Colour of blood varies in arteries and veins.

Blood constitutes 8% – 10% of the body mass.

Blood is slightly acidic.

Liver

Spleen

Bone marrow

Heart

(i) – (D), (ii) – (A), (iii) – (B), (iv) – (C)

(i) – (C), (ii) – (A), (iii) – (D), (iv) – (B)

(i) – (D), (ii) – (C), (iii) – (B), (iv) – (A)

(i) – (A), (ii) – (C), (iii) – (D), (iv) – (C)

urethra

urinary bladder

pelvis

pyramid

medulla

neurons

the Bowman's capsule

nephrons

cells

blood vessels

to distribute heat

to protect enzymes

to cause blood clotting

to destroy bacteria

to distribute hormones to the respective sites

RBCs are of several kinds whereas WBCs are of one kind.

Leukocytes show amoeboid movement.

WBC contains hemoglobin.

The walls of auricles are thicker than that of ventricles.

The average life of RBCs in our body is about 120 hours.

thick walled and blood flows under high pressure

thin walled and blood flows under high pressure

thick walled and blood flows under low pressure

thick walled and blood flows at the atmospheric pressure

thin walled and blood flows under low pressure

Due to the compression of contracting bladder muscles to prevent the backward flow of urine

Due to the contraction of abdominal cavity to prevent the loss of excess salts and proteins

Due to the contraction of urethral orifice to prevent the excretion of useful vitamins and minerals

Due to the contraction of sphincter muscles of bladder to prevent the loss of hormonal secretion and antibodies

Due to the compression of collecting tube to maintain osmoregulation

Mouth

Oesophagus

Small intestine

Stomach

To increase the surface area for absorption of minerals

To increase the surface area for digestion of food

To facilitate the diffusion of gases

To regulate the ejection of waste material

To digest starch

To emulsify fats

To decrease pH of food

To digest proteins

Because if they are present in active form, they will digest the walls of the alimentary canal

Because if they are present in active form, they will inhibit the digestion of starch

Because if they are present in active form, they will inhibit the activity of other enzymes, like lipase

Because if they are present in active form, they will increase the acidic concentration in the small intestine

(a) – (4), (b) – (3), (c) – (1), (d) – (2)

(a) – (1), (b) – (3), (c) – (4), (d) – (2)

(a) – (3), (b) – (1), (c) – (3), (d) – (2)

(a) – (3), (b) – (4), (c) – (1), (d) – (2)

Oesophagus

Mouth

Stomach

Small intestine