Tag: cardiac cycle

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

The heart is an organ which beats

  1. Twenty hours in twenty four hours

  2. Ten hours in twenty four hours

  3. Continuously

  4. Eight hours in twenty four hours
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The heart beat continuously and pumps the blood by contraction and relaxation of cardiac muscles.
Cardiac output is defined as the amount of blood pumped out by the ventricles in a minute.The volume of blood pumped by each ventricle in 1 minute is termed as the cardiac output. 
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

Normal heart rate of a healthy individual is 

  1. 20-40 beats/min

  2. 60-100 beats/min

  3. 200-600 beats/min

  4. 2-10 beats/min
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The cardiac cycle refers to a complete heartbeat from its generation to the beginning of the next beat. The frequency of the cardiac cycle or the heart rate is expressed as heart beats per minute. Normal adult human heart rate ranges from 60-100 bpm. So, the correct answer is option B.

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

Heart beat is  initiated by

  1. Sinu-auricular node

  2. Atria-ventricular node

  3. Sodium ion

  4. Purkinje's fibres
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The sino-atrial node (SAN) is a mass of nodal tissue found in the upper part of right auricle. It generates the nerve impulses which is responsible for starting the contraction of the heart. It controls the rhythm of the heart contraction. Hence, it is called as the natural pacemaker of the heart.

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

Pulse rate can be defined as

  1. The rate at which the blood is pumped

  2. The rate at which the blood is filtered

  3. The rate at which the blood is oxygenated

  4. The rate at which the blood is deoxygenated
Reveal answer Fill a bubble to check yourself
A 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 normal heart rate is about 72 beats per minute. The heart rate is same as pulse rate because the pumping action of the heart causes an increase in blood pressure in arteries that leads to noticeable pulse. Hence pulse rate can be defined as the rate at which the blood is pumped.

So, the correct answer is 'The rate at which the blood is pumped'.

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

In which animal there is no blood for transport of nutrients?

  1. Fish

  2. Hydra

  3. Sponges

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All vertebrates possess a muscular chambered heart. Fishes have a 2-chambered heart with an atrium and a ventricle. In fishes, the blood transports nutrients when the heart pumps blood throughout the body. Animals like hydra and sponges do not possess any circulatory system. The water in which they live brings food and nutrients as it enters their body. The water carries waste materials and carbon dioxide as it moves out. Hence In animals like hydra and sponges, there is no blood for transport of nutrients.

So, the correct answer is 'Both B and C'.

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

The normal heart rate is

  1. 62 beats per minute

  2. 72 beats per minute

  3. 54 beats per minute

  4. 52 beats per minute
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • This sequential event in the heart that 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 heartbeats per minute in resting person is called a normal heart rate. 
  • The normal heart rate is about 72 beats per minute.

So, the correct answer is '72 beats per minute'.
Multiple choice biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

The amount of blood pumped by the heart per minute is

  1. 2 litres

  2. 3 liters

  3. 5 litres

  4. 4 litres
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • The amount of blood pumped by the heart per minute is called the cardiac output.
  • The heart of a normal person beats 72 times per minute. This is called the heart rate. During each and every heartbeat, the ventricles pump about 70 ml of blood.
  • This is known as stroke volume. This means heart pumps 72 x 70 ml = 5040 ml or approximately 5 liters of blood per minute.

    Thus 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

The pulse rate can be determined from the

  1. Arteries

  2. Veins

  3. Capillaries

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

The pulse rate is the number of times one can feel a pulse in one minute. The radial artery is present on the thumb side of the wrist. To measure the pulse rate place two fingers between the bone and the tendon over your radial artery. Count the number of beats in 15 seconds, multiply this with four you will get the pulse rate. Therefore The pulse rate can be determined from the arteries.

So, the correct answer is 'Arteries'.

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

The unit of measurement of heart beat is

  1. Beats per minute

  2. Liters per minute

  3. Beats per second

  4. Beats per hour
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • This sequential event in the heart that 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 heartbeats per minute in resting person is called a normal heart rate. 
  • The normal heart rate is about 72 beats per minute. Hence the unit of measurement of the heartbeat is Beats per minute.

So, the correct answer is 'Beats per minute'.