3.3 the heart

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

3.3 The heart

Planning for today + learning goals

• Option:

3.3 alone or with teacher (10 min)

• Practice 3.3 (15 min)
• Quiz (10 min)

Learning goals:

1. You can name the parts of the heart with their features and functions
2. You can name the blood vessels that come and go from the heart.

Location of the heart

The heart

-The heart is a double pump

-right side pumps oxygen poor

  blood to the lungs

-left side pumps oxygen rich 

  blood to the rest of the body.

Right side

Left side

Structure of the heart

The heart is a hollow muscle.

Coronary arteries (red arteries) supply Oxygen rich blood + nutrients to the heart

Coronary veins (blue veins) carry Carbon dioxide + waste products away from the heart. 

The heart has four chambers:

- Left atrium

- Right atrium

- Left ventricle

- Right ventricle

Blood always enters the heart via the atria.

Septum: a wall separating the left and right side of the heart.

Bloodflow

*Superior vena cava: Oxygen-poor blood from head + arms to right atrium

*Inferior vena cava: Oxygen-poor blood from torso + legs to right atrium

*Pulmonary veins: Oxygen-rich blood from lungs to left atrium 

*Aorta: Pumps Oxygen-rich blood to rest of the body

atrioventricular valves

*Atria + ventricles separated by atrioventricular valves.

*Semilunar valves keep blood from flowing back into ventricles.

As you can see, a valve only opens in one direction

cardiac cycle

- atria contract, blood flows into 

   ventricles (ventricles relaxed)

- ventricles contract, blood 

   flows into aorta and pulmonary 

   artery (atria relaxed)

- Heart relaxes, blood flows 

   into atria 

Now you try!

Read 3.3

Make ex. 1, 2, 3, 5, 7

Page 195

Done? 

Check if you made all the homework:

3.1: 2, 3, 4, 6

3.2: 1, 2, 3, 6, 7, 8

Done?

Make test yourself 3.3