Human Heart

Q. Functionally, cardiac muscles are similar to

1. Unstriped muscles
2. Striped muscles
3. Striped and smooth muscles
4. None of the above

Q.

Tachycardia is

1. Rapid rate of heartbeat

2. Slow rate of heartbeat

3. Abnormal heart rhythm

4. High blood pressure

Q. The blood does not flow in blood vessels and circulates throughout the body is called as open circulatory system. Open circulatory system is the characteristic feature of ___________

1. Platyhelminthes
2. Amphibia
3. Aschelminthes
4. Arthropoda

Q. State whether the following statements are true(T) or false(F):

(iv) CO2 is transported to the lungs by the blood in two forms: as bicarbonates and as carbamino-haemoglobin. T/F

Q. What is Vertebrates ?

Q. Assertion :The SA node acts as pacemaker. Reason: The SA node is located in the wall of the right atrium near the inter-atrial septum.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Both Assertion and Reason are incorrect.

Q. The myocardium is found in

1. Brain of mammals
2. Lungs of mammals
3. Heart of mammals
4. Testes of mammals

Q. What is the significance of Av bundle and av node?

Q. Sort the parts according to the order in which deoxygenated blood travels from the heart to the lungs:

1. Pulmonary Artery
2. Right Atrium
3. Lungs
4. Right Ventricle

1. $2-1-3-4$
2. $2-4-1-3$
3. $4-2-1-3$
4. $3-1-2-4$

Q. Mention the names of a and b in the given figure.

1. Cholesterol crystals, smooth muscle cells
2. Fat, smooth muscle cells
3. Lumen of vessel, ulcer
4. Endothelium, fat

Q.

ECG depicts the depolarisation and repolarisation processes during the cardiac cycle. In the ECG of a normal healthy individual one of the following waves is not represented.

1. Depolarisation of atria

2. Repolarisation of atria

3. Depolarisation of ventricles

4. Repolarisation of ventricles

Q. ' Bundle of His ' is a part of which one of the following organs in humans?

1. Brain
2. Heart
3. Kidney
4. Pancreas

Q. In which of the following class/es of vertebrates there are groups of animals that posses 2 chambered heart?

1. Amphibians only
2. Fish, reptiles and mammals
3. Reptiles and Amphibians
4. Fishes only

Q. In connection with circulatory system, valves are present

1. Not only in heart and blood vessels of vertebrates and invertebrates but in vertebrate lymphatics as well
2. Vertebrate heart only
3. Vertebrate and invertebrate hearts only
4. Vertebrate hearts, invertebrate hearts and their blood vessels