Tag: heart beat

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Questions Related to heart beat

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

The first heart sound is produced when

  1. Intraventricular pressure decreases.

  2. Semilunar valve snaps shut.

  3. Bicuspid and tricuspid valve close quickly.

  4. Diastole begins.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The lub is the first heart sound, commonly termed S1, and is caused by turbulence caused by the closure of mitral and tricuspid valves at the start of systole. The second sound, dub or S2, is caused by the closure of aortic and pulmonary valves, marking the end of systole.

So, the correct answer is option C.

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

One heartbeat in an average man lasts  

  1. 0.8 second

  2. 0.2 second

  3. 0.5 second

  4. 1 minute
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

One heartbeat in an average man lasts  0.8 second.

Heart rate, also known as pulse, is the number of times a person's heart beats per minute. A normal heart rate depends on the individual, age, body size, heart conditions, whether the person is sitting or moving, medication use and even air temperature. Even emotions can have an impact on heart rate. For example, getting excited or scared can increase the heart rate. But, most importantly, getting fitter lowers the heart rate, by making heart muscles work more efficiently.

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

Heart rate is same as

  1. Flow rate

  2. Pulse rate

  3. Breath rate

  4. Inhalation rate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This sequential event in the heart which is cyclically repeated is called the cardiac cycle. Each cardiac cycle consists of systole and diastole of both the atria and ventricles. Each cardiac cycle represents one heartbeat. The number of heart beats per minute in resting person is called as normal heart rate. The normal heart rate is about 72 beats per minute. The heart rate is same as pulse rate because the contractions of the heart cause an increase in blood pressure in arteries that leads to noticeable pulse.

So, the correct answer is 'Pulse rate'.

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

Seema was running. The supply of oxygen to muscles will __________.

  1. Remain same

  2. Increase

  3. Decrease

  4. Decrease and then increase
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
During exercise body's muscles increase their activity level and consumes more oxygen. Hence to meet the oxygen demand of the muscles Heart rate and blood pressure increases which leads to flooding of muscles with oxygen. Hence when Seema was running, if checked immediately her heart rate will be found increased.
So, the correct answer is 'Increase'.
Multiple choice biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

Circulation was discovered by 

  1. William Harvey

  2. Willian Henry

  3. Michael Harvey

  4. William Smith
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The human circulatory system consists of a muscular four-chambered heart, a network of closed branching blood vessels and blood, the fluid which is circulated. Circulation was discovered by William Harvey. He was the first to recognize the full circulation of blood in the human body and to provide experiments and arguments to support this idea.

So, the correct answer is 'William Harvey'.

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

Mammalian heart is

  1. Neurogenic

  2. Myogenic

  3. Digenic

  4. None of the above.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The human heart is an example of myogenic heart, it possesses cardiac muscle helping the heart to automatically contract spontaneously; which do not need any stimuli as in neurogenic heart. A myogenic heart is capable of generating a cardiac contraction independent of nervous input. In a myogenic heart, contraction is initiated by the cells called myocyte  (Pacemakers)itself instead of an outside occurrence or stimulus such as nerve innervation.

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

State whether the following statements are true or false.
Smaller animals generally have a lower pulse rate than larger animals.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Smaller animals have much higher metabolism; proportionate to body size, smaller animals tend to have a much smaller heart than larger animals. This means that in order to circulate blood at the same rate, the hearts of smaller animals need to pump more times within a specified time because the volume they can pump each time is smaller.

So, the correct option is 'False'.

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

Choose the correct answer from the alternatives given.
Heart sounds are produced by:

  1. contraction of the myocardium

  2. flow of blood in the atria

  3. flow of blood in the ventricles

  4. closure of the heart valves
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Heart sounds are noises generated by the closing and opening of the heart valves. In a healthy individual, there are two normal heart sounds called lub and dub. 
  • Lub is the first heart sound. It is associated with the closure of the tricuspid and bicuspid valves at the beginning of systole. 
  • The second heart sound dub is associated with the closure of the semilunar valves at the beginning of diastole.
So, the correct option is 'Closure of the heart valves'.