Heart

Q.

Question 11
Describe the function of the heart.

Q.

What are capillaries?

Q.

What are four facts about the Circulatory system?

Q. Define: Heartbeat and heart rate

Q.

When we are running then Why does our rate of heart beat also increase?

Q.

The rhythmic contraction and relaxation of heart muscles is known as ________.

1. Exhalation rate

2. Breathing rate

3. Heart beat

4. Inhalation rate

Q.

Which among the following animals has two chambered heart?

1. Frog

2. Crocodile

3. Peacock

4. Fish

Q.

With the help of a diagram, explain the circulation of blood.

Q.

What is the speed of the blood moving through our veins and arteries in terms of km/h?

Q.

Do fish have blood?

Q.

Which process in plants is demonstrated using Ringing experiment?

Q. In which body cavity is the heart located?

1. Pelvic cavity
2. Abdominal cavity
3. Chest cavity
4. Cranial cavity

Q. Describe the mechanism of heart in transporting blood in all parts of the human body.

Q.

Name the excretory organs in flatworms, earthworms, insects and snails.

Q. The muscular organ which pumps blood through the blood vessels of the circulatory system is the ______.

1. stomach
2. kidney
3. lung
4. heart

Q.

Oxygenated and deoxygenated blood mix inside the heart. True or false?

1. True

2. False

Q. When the arteries reach tissue/cells they divide into smaller blood vessels called

1. Nerves
2. Capillaries
3. Veins
4. Aorta

Q.

a) What is Heart beat?
b) What is pulse rate?

Q. Which of the following are parts of a stethoscope?

1. Chest piece
2. Tube
3. Ear piece
4. Lense

Q.

Why is blood known as the fluid connective tissue ?

Q. In the human heart, oxygenated and deoxygenated blood are separated.

1. True
2. False

Q.

The oxygenated blood and deoxygenated blood in the heart do not get mixed.Give reasons.

Q. The two upper chambers of the heart are called ______ .

1. atria
2. arteries
3. veins
4. ventricles

Q. Which of the following correctly represents the order in which oxygenated blood travels from the lungs to the body?

1. Pulmonary vein $\to$ Left atrium $\to$ Left ventricle $\to$ Aorta
2. Aorta $\to$ Left ventricle $\to$ Left atrium $\to$ Pulmonary vein
3. Pulmonary vein $\to$ Left ventricle $\to$ Left atrium $\to$ Aorta
4. Aorta $\to$ Left atrium $\to$ Left ventricle $\to$ Pulmonary vein

Q.

In the given diagram, which chambers contract together?

1. A and B

2. B and D

3. C and D

4. A and C

Q.

What is the special feature present in human heart which does not allow mixing of blood when oxygen rich and carbon dioxide rich blood reach the heart?

Q.

How exchange of gases occure in the lungs

Q.

Pulse wave is mainly caused by the

1. systole of atria

2. diastole of atria

3. systole of the left ventricle

4. systole of the right ventricle

Q.

What is the rate of heartbeat in healthy adult human at resting condition?

1. 80-90 times

2. 85-90 times

3. 70-80 times

4. 60-70 times

Q. One molecule of haemoglobin will combine with four molecules of oxygen.If 1g of haemoglobin combine with 1.642ml of oxygen at 27degree Celsius and at pressure of 1atm. What is the molar mass of haemoglobin.