Transcript Circulatory System

Function & Structures of
Cardiovascular System
Cardiovascular System Function
 Transports materials to and from the cells
 Nutrients
 Oxygen
 Waste
 Hormones
Closed Circulatory System
closed circulatory system
blood is confined to vessels
The heart pumps blood into large vessels
that branch into smaller ones leading into the organs.
Materials exchanged by diffusion between blood and
the interstitial fluid bathing the cells.
Cardiovascular System Structures
1.
The Heart- cardiac muscle
four
chambers
Right atrium
Right ventricle
Left atrium
Left ventricle
2. Blood Vessels -A network of tubes
Arteriesarterioles
move away from the heart
Circular Smooth Muscle
Capillaries
– where gas exchange takes place.
One cell thick
Serves the Respiratory System
VeinsVenules
moves towards the heart
Skeletal Muscles contract to force blood back from legs
One way valves
Did you know? When veins break - varicose veins form
3. The Blood
A. Plasma


Liquid portion of the blood.
Contains clotting factors,
hormones, antibodies,
dissolved gases, nutrients and
waste
B. Erythrocytes - Red
Blood Cells
Carry
hemoglobin and
oxygen.
Did you know?
Red blood cells do not have a
nucleus and live only about
120 days and that they cannot
repair themselves.
C. Leukocytes – White Blood
cells
Fight
infection and are formed
in the bone marrow
D. Thrombocytes –
Platelets.
Cell
fragments (proteins)
that clot blood by sticking
together
Two Circuits
Pulmonary circuit
The blood pathway
between the right side of
the heart, to the lungs, and
back to the left side of the
heart.
Systemic circuit
The pathway between the
left and right sides of the
heart (from heart to body
and back).