Tag: cardiac cycle

Questions Related to cardiac cycle

If the systolic pressure is $120$mm Hg and diastolic pressure is $80$mm Hg, the pulse pressure is $80$mm Hg, the pulse pressure is ______.

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. $120\times80 = 9600$mm Hg

  2. $120+80 = 200$ mm Hg

  3. $120 - 80 = 40$mm Hg

  4. $\frac{120}{40} = 3$mm Hg

Show answer
Correct Option: C
Explanation:
The pulse pressure can be defined as the difference between the diastolic and systolic pressure of an individual’s heart. If the normal diastolic and systolic pressure of the adult human heart is 120 mm Hg and 80 mm Hg, respectively then the pulse pressure is 120 - 80 = 40 mm Hg.
Thus, the correct answer is '120−80=40mm Hg.'

An adult human with average health has systolic and diastolic pressures as

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. 120 mm Hg and 80 mm Hg

  2. 50 mm Hg and 80 mm Hg

  3. 80 mm Hg and 80 mm Hg

  4. 70 m Hg and 120 mm Hg

Show answer
Correct Option: A
Explanation:

Blood pressure is the pressure against the walls of the blood vessels produced by the discharge of blood into them by contraction of the left ventricle.

Systolic pressure: The temporary rise in BP during the contraction of the heart is called systolic pressure.
Diastolic pressure: The temporary fall in BP during the relaxation of the heart is termed as diastolic pressure.
For a healthy resting adult person, the average systolic/ diastolic pressures are 120/80 mm Hg in arteries near the heart.
So, the correct answer is '120 mm Hg and 80 mm Hg'.

Which one of the following is a matching pair?

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. Lubb - sharp closure of AV valves at the beginning of ventricular systole

  2. Dub - sudden opening of semilunar valves at the beginning of ventricular diastole

  3. Pulsation of the radial artery - valves in the blood vessels

  4. Initiation of the heart beat - Purkinje fibres

Show answer
Correct Option: A

The first heart sound is produced when

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. Intraventricular pressure decreases

  2. Semilunar valve snaps shut

  3. Bicuspid and tricuspid close quickly

  4. Diastole begins

Show answer
Correct Option: C
Explanation:

first heart sound is produced by the closing of the atrioventricular valves . The first heart sound, or S1, forms the "lub" of "lub-dub" and is composed of components M1 (mitral valve closure) and T1 (tricuspid valve closure). Normally M1 precedes T1 slightly. It is caused by the closure of the atrioventricular valves, i.e. tricuspid and mitral (bicuspid), at the beginning of ventricular contraction, or systole. So, the correct option is C.( Bicuspid and tricuspid close quickly )

In a normal human adult (at resting position), how much blood does the heart pump per minute?

biology simple nutrients into cells heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. 5 litre

  2. 3 litre

  3. 1 litre

  4. 7 litre

Show answer
Correct Option: A
Explanation:

The blood travels around the body and back to the heart in about one minute if the person is at rest. The heart beats 70 times a minute, with each beat the heart pumps 60 to 90 mililiters (2 to 3 ounces) of blood out of the heart. It can move 5 liters of blood in one minute and 7600 liters (2000 gallons) per day. So, the correct option is "A" (5 Litre).

Which of the following statements is false?

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. $Mg^{2+}$ ions form a complex with ATP

  2. $Ca^{2+}$ ions are important in blood clotting

  3. $Ca^{2+}$ ions are not important in maintaining the regular beating of the heart

  4. $Mg^{2+}$ ions are important in the green parts of plants.

Show answer
Correct Option: C
Explanation:

Calcium is important for heart because the movement of calcium ions help the heart muscles to contract. This occurs because: calmodulin, a protein binds to the sodium channel, helps keep it open. Calcium ions regulate the connection between the protein and the channel by causing the protein to hook up to the channel. This in turn, keeps it open and allows sodium ions to pass through. In the absence of Ca$^2$$^+$ the heart beat will be irregular. 

So the correct answer is ' Ca2+ ions are not important in maintaining the regular beating of the heart'.

The first heart sound is

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. DUP

  2. LUBB

  3. LUPP

  4. BUD

Show answer
Correct Option: B
Explanation:

The first heart sound 'lubb' is made by the closing of the mitral valve and tricuspid valve (atrioventricular valves). The second heart sound is 'dub' and is caused by the closure of the aortic valve and the pulmonary valve. 

So, the correct option is 'LUBB'.

In human beings heart beat is initiated by

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. Purkinje fibres

  2. AV node

  3. SA node

  4. Bundles

Show answer
Correct Option: C
Explanation:

Sinoatrial node is a cluster of cells present in the right atria just below the opening of  Vena cava. It autonomously generates electrical impulses that initiate the muscle contraction in the atria.

It is called the natural pacemaker of the heart.
So, the correct answer is 'SA node'.

First heart sound is called?

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. Lubb

  2. Dub

  3. Murmur

  4. None of these

Show answer
Correct Option: A
Explanation:

  • The heart produces a characteristic sound at the beginning g of ventricular systole or contraction. 
  • These sounds are a result of the closure of the atrioventricular valves, the mitral valve and the tricuspid valve. 
  • The sounds produced are “lubb-dub”, lubb being the first of the two. 
  • So, the correct answer is 'Lubb'.

An artifical pacemaker is implanted sub-cutaneously and connected to heart in patients.

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. having high B.P

  2. having irregularity in heartbeat

  3. having blockage in heart

  4. suffering from arteriosclerosis.

Show answer
Correct Option: B
Explanation:

A pacemaker insertion is the implantation of a small electronic device that is usually placed in the chest (just below the collarbone) to help regulate slow electrical problems with the heart. A pacemaker may be recommended to ensure that the heartbeat does not slow to a dangerously low rate.


So, the Correct option is B.