Heart cycle

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

Heart cycle

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What is the name of part S

1. Red blood cell
2. White blood cell
3. Blood plasma
4. Platelet

What is the correct order, if we follow a oxygen molecule that enters the body? Start at 'the lungs'.

The left ventricle

The right ventricle

The left atrium

The right atrium

The aorta

The lungs

The rest of the body

What is the name of part 10?

1. Superior vena cava
2. Aorta
3. Pulmonary artery
4. Pulmonary veins

Blood flow

Left and right are separate, but contract at the same time.

Atria need to contract before the ventricles

cardiac cycle

- atria contract, blood flows into 

   ventricles (atrial systole)

- ventricles contract, blood 

   flows into aorta and pulmonary 

   artery (ventrical systole)

- Heart relaxes, blood flows 

   into atria (diastole)

How does the cardiac cycle go?

1. Atria contract, cardiac pause, ventricles contract
2. Ventricles contract, cardiac pause, atria contract
3. Atria contract, ventricles contract, cardiac pause
4. Ventricles contract, atria contract, cardiac pause

Put the texts underneath the corresponding picture.

Cardiac pause - heart fills with blood

Atria contract

Cardiac pause - heart fills even more with blood

Ventricles contract

Blood flows into arteries

How to control blood flow

Two options to adjust:

1. Pump faster/slower --> adjust heart rate

2. Pump with more or less force --> adjust blood pressure

Heart rate

Heartbeat sound consists of two parts: lub and dub

Measuring heart rate/pulse

1. find your pulse

2. count during the 30 seconds of the timer

3. multiply by 2 because we measure pulse per minute

What is your heart rate?

Electrical control

In a very stressful situation what can happen to the heart?

Heart fibrillation 

The electrical communication in the heart is not following the correct order and path. This cause the parts to contract in the wrong order/not powerful
enough

What to do?

Use a defibrillator to 'reset' the heart rhythm

Homework

Worksheet heart rate on the Classroom