Cardiovascular System | MCQs

Explanation

 The heartbeat is normally initiated by the sinoatrial (SA) node, a group of specialized cells in the right atrium, acting as the heart's natural pacemaker. 

Explanation

Explanation

Circulatory system

The aorta is a large tubular blood vessel that supplies the body with oxygenated blood. It starts at the bottom left of the heart and passes through the chest and abdomen. Along the way, blood vessels branch off from the aorta and extend to organs and supporting tissues.

Explanation

Arteries are blood vessels responsible for carrying oxygen-rich blood away from the heart to the body.

Veins are blood vessels that carry blood low in oxygen from the body back to the heart for reoxygenation.

Explanation

The cardiovascular system includes the heart and blood vessels, which pump and circulate blood throughout the body.

It transports oxygen, nutrients, hormones, and removes waste from body tissues.

Explanation

Adrenaline (also known as epinephrine) increases the following effects on the heart:

Heart Rate:

Adrenaline increases the heart rate (positive chronotropic effect).

Contractility:

It increases the force of heart muscle contractions (positive inotropic effect).

Conduction Velocity:

It enhances the speed of electrical conduction through the heart (positive dromotropic effect).

Cardiac Output: 

Due to the increased heart rate and contractility, adrenaline boosts the overall cardiac output.

Explanation

Explanation

• A pulse can be felt when an Artery passes over a bone.
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• There are seven main points in the human body to check the pulse
• A pulse oximeter is used to: Measure the pulse rate and oxygen in the blood.
• The beating of the pulse is due to the flow of blood
• World Pulses Day is celebrated on February 10 every year and recognized Pulses as a global food.
•  A normal resting heart rate should be between 70 to 80 beats per minute,
  

Explanation

• approximately 7–8% of an adult’s body weight
• approximately 8–9% of a child’s body weight
• approximately 9–10% of an infant’s body weight

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• Scientists estimate the volume of blood in a human to be approximately 7 per cent of body weight.
• An average adult with a weight of 150 to 180 pounds
• will contain approximately 1.2 to 1.5 gallons (4.7 to 5.5 litres) of blood.

Explanation

descending aorta ends near your belly button. There, it splits into two arteries called your right and left common iliac arteries