Railway Science (Biology – Circulatory System) (Part-II)

Total Questions: 19

1. Which of the following carries blood from the heart to different parts of the body? [RPF Constable 02/02/2019 (Morning)]

Correct Answer: (d) Arteries
Solution:

Arteries (carry oxygenated blood). Tissue - A group of cells that have a similar structure and that function together as a unit. Lymph - A colourless fluid containing white blood cells, which bathes the tissues and drains through the lymphatic system into the bloodstream. Veins (carry deoxygenated blood) - Blood vessels located throughout the body that collect oxygen-poor blood and return it to heart.

2. Fishes have a _______ chambered heart. [RRB Group D 17/09/2018 (Afternoon)]

Correct Answer: (d) Two
Solution:

Heart is a part of the Circulatory system that pumps the blood to different parts of the body. Three chambers of Hearts - Amphibians and reptiles. Four chambers - Mammals and birds. Largest heart - Blue whale.
Most reptiles have two atria and one ventricle. The only exceptions are the living species of crocodilians (alligators, caimans, crocodiles, and gharials), that have 4 chambered hearts. Cockroach has 13 chambered heart.

3. Which of the following animals can tolerate some mixing of oxygenated and deoxygenated blood streams? [RRB Group D 23/09/2018 (Evening)]

Correct Answer: (b) Frog
Solution:

Frogs have a three-chambered heart with one ventricle. Pigeon: 4-chambered heart, complete separation, efficient oxygenation. Fish: Single loop, incomplete separation, naturally mixed blood. Rabbit: 4 - chambered heart, no mixing of blood streams.

4. The following have red vascular connective tissue: [RRB Group D 01/10/2018 (Afternoon)]

Correct Answer: (c) Blood
Solution:

Blood is composed of erythrocytes (red blood cells), leukocytes (white blood cells) and platelets. It is present in blood vessels (arteries, veins, capillaries).

5. Which of the following is NOT true about vascular system? [RRB Group D 03/10/2018 (Morning)]

Correct Answer: (c) Blood is white or red vascular connective tissue.
Solution:

Blood is a liquid connective tissue that contains plasma, blood cells and platelets. Plasma is a brown, sticky fluid that makes up about 55 percent of blood. Erythrocytes, leukocytes and platelets are collectively called the constituent elements and they make up about 45 percent of blood.

6. Choose the option that is NOT true about the vascular system. [RRB Group D 03/10/2018 (Afternoon)]

Correct Answer: (a) Blood is only white vascular connective tissue.
Solution:

Blood is a special connective tissue consisting of a fluid matrix, plasma, and formed elements. Plasma is a straw coloured, viscous fluid constituting nearly 55 per cent of the blood. 90-92 percent of plasma is water and proteins contribute 6-8 percent of it. Blood is normally slightly basic, with a normal pH range of about 7.35 to 7.45.

7. Choose the option that is not true regarding the vascular system. [RRB Group D 03/10/2018 (Evening)]

Correct Answer: (d) It is about 1.7-1.8% of body weight.
Solution:

The vascular system forms about 7-8% of the body weight. Blood is known as a connective tissue due to it has a matrix. The red blood cells are called erythrocytes, and white blood cells called leukocytes. The vascular system, comprising arteries, capillaries, and veins, supplies oxygen and nutrients to all organs.

8. Choose the option that is not true regarding the vascular system. [RRB Group D 04/10/2018 (Morning)]

Correct Answer: (c) Blood flows through them jerkily and rapidly, at low pressure.
Solution:

Blood flow is usually smooth and steady . Although flow speed can change based on activity and location, it's typically not very fast. Also, blood pressure is highest in the arteries close to the heart and decreases gradually as it moves through smaller blood vessels.

9. Choose the option that is not true regarding the vascular system. [RRB Group D 04/10/2018 (Afternoon)]

Correct Answer: (d) The human heart is the size of a closed fist.
Solution:

The vascular system, also called the circulatory system that carries blood and lymph fluid through the body. Human Heart: It is a muscular organ situated in the mediastinum (the space between sternum and vertebrae and between lungs).

10. Blood is a/an _______ tissue. [RRB Group D 05/10/2018 (Morning)]

Correct Answer: (c) connective
Solution:

Blood - Made up of blood cells, which are suspended in a fluid called plasma. The blood cells include red blood cells, white blood cells, and platelets. Nervous tissue - Made up of neurons, which are cells that transmit signals throughout the body.
Epithelial tissue - Covers the body's surfaces and lines its organs. Muscle tissue - Responsible for movement. Connective tissue is a type of tissue that supports and connects other tissues.