Transcript The Circulatory System

The Circulatory System
Function
 Consists of the heart
and blood vessels
 Carries oxygen and
nutrients to the body’s
cells and remove
carbon dioxide and
other wastes
 Protects us from
disease
Blood
Plasma – the liquid part
Red blood cells –
contain hemoglobin,
carry oxygen
White blood cells –
fight invaders
Platelets – clot blood to
stop bleeding
From Blood to Tissues
 Substances move in and out of
the capillaries by diffusion
Food & oxygen passes into
cells from blood
Carbon dioxide & wastes
pass out of cells into blood
The Heart
 Keeps blood moving through
the circulatory system
 Constantly beats by first
squeezing & then relaxing
 Heart beat: normally beats
65-75 beats per minute
 Made of cardiac muscle
Structure of Your Heart
 The human heart has 4
chambers with
muscular walls
 Atria – upper
chambers – receive
blood into the heart
 Ventricles – larger
lower chambers –
pump blood out of the
heart
12. Aorta
1. Vein from
upper body
2. Right atrium
5. Pulmonary
valve
6. Pulmonary
arteries
7. Pulmonary
veins
8. Left atrium
3. Tricuspid valve
9. Bicuspid valve
4. Right ventricle
11. Aortic valve
1. Vein from
lower body
10. Left ventricle
The Movement of Blood
1. Veins from upper & lower body bring blood that is
low in oxygen and high in carbon dioxide into the
right atrium.
2. Right atrium pumps blood into the left atrium.
3. Right ventricle pushes the blood to lungs
4. In the lungs, blood picks up oxygen & releases
carbon dioxide.
5. Oxygenated blood from lungs is carried to the left
atrium.
6. the left atrium sends oxygenated blood into the left
ventricle.
7. the left ventricle sends oxygenated blood into the
aorta, the main artery leading to the body
8. Arteries carry oxygenated blood all over the body