Human Body Organ System - 2 (Digestion, Excretion an...
Human Body Organ System – 2 (Digestion, Excretion and Circulation)
Questions
Which of the following statements is not true regarding blood?
- 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.
Which of the following does not have dead and destroyed red blood cells?
- Liver
- Spleen
- Bone marrow
- Heart
Match the following liquids with their locations:
| (i) Blood | (A) Spleen |
| (ii) Aqueous humour | (B) Skeleton joints |
| (iii) Synovial fluid | (C) Eye |
| (iv) Lymph | (D) Capillaries |
- (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)
The expanded part of the ureter proximal to kidney is called
- urethra
- urinary bladder
- pelvis
- pyramid
- medulla
The human kidney is made up of millions of structural and functional units called
- neurons
- the Bowman's capsule
- nephrons
- cells
- blood vessels
The function of WBC is
- to distribute heat
- to protect enzymes
- to cause blood clotting
- to destroy bacteria
- to distribute hormones to the respective sites
Which of the following options is correct?
- 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.
Arteries are
- 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
As the ureters pass obliquely through the bladder wall, their openings get shut. Why?
- 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
Which of the following is a part of the alimentary canal where no digestion takes place?
- Mouth
- Oesophagus
- Small intestine
- Stomach
Why are finger-like projections present in the inner lining of the large intestine?
- 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
What is the role of bile juice in human digestion?
- To digest starch
- To emulsify fats
- To decrease pH of food
- To digest proteins
Why are pepsin and trypsin released in an inactive form in the alimentary canal?
- 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
Which of the following correctly represents the enzymes with their functions?
| (a) Amylase | (1) Breakdown of fats |
| (b) Trypsin | (2) Breakdown of lactose |
| (c) Lipase | (3) Breakdown of starch |
| (d) Lactase | (4) Breakdown of protein |
- (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)
From where does the digestion of food start?
- Oesophagus
- Mouth
- Stomach
- Small intestine