Transcript Circulatory - Bishop Ireton High School

Circulatory
Function
 Distribute blood to all the cells in the body.
 The red blood cells carry the O2 for cellular
respiration.
 Then RBCs carry the CO2 produced in cells back to the
lung for exhalation
Structure
Heart muscle
4 chambers
Right atria
Left atria
Right ventricle
Left Ventricle
Flow of Blood
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Right atria
Right ventricle
Pulmonary artery
Lungs
Pulmonary vein
Left atria
Left ventricle
Aorta
Body
Right atria
Pulmonary circulation
Systemic circulation
Heart Chambers
 Atria-Blood enter heart
Right side Deoxygenated blood
Left side oxygenated blood
 Ventricles-Blood leaves the heart
Right side lead to lungs
Left side leads to body
Parts of the Heart
From upper
body
To R. Lung
From R.
Lungs
From Lower
body
To Body
To L. Lung
From Left
Lung
Septum
Pulmonary and Systemic systems
Pulmonary system
Systemic System
Systemic System
Arteries
Capillaries
 Carry blood away from
the heart
 Small
 Thicker because they
are under pressure
from the pumping of
the heart.
 1 cell thick
Veins
 Carry blood to the heart
 Thinner walls because
they are not under
pressure from the heart
pumping.
 Blood moves back to the
heart through movement
of the skeletal muscle.
Valves
 Flaps of connective tissue between atria and ventricle
of heart and at the exits of ventricles
 Tricuspid- Between R. Atria and Ventricle
 Bicuspid- Between L. Atria and ventricle
 Prevents back flow of blood by maintaining one-way
flow through the heart and the veins
 Increases pumping efficiency of the heart
Pacemaker
 Sinoatrial (SA) node -located in right aorta ignites
and initiates contractions of Atrium.
 Autorythmic cells (self exciting)
 Delayed impulse carried to atrioventricular (AV)
node in bottom of Atria.
 AV note relays impulse via the Bundles of His to the
Purkinje Fibers.
 Ventricle contracts forcing blood out of the heart
SA and AV nodes
of His
Blood
Component Function
Red Blood Cell
Contains hemoglobin.
Binds to 4 oxygen molecules.
Have no nucleus. Concave
Last 120 days
Produced by bone marrow-, ribs, humerus,
femur, sternum
White blood cell
(leukocytes)
Produced in bone marrow, Have nuclei
Can travel through lymphatic system
Fights infections
Last for months to years in body
1% of blood
Platelets
Function in clotting
Produce fibrin which links together to form clot.
Plasma
Fluid portion
90% water
Contains dissolved proteins, enzymes ,gasses and
waste
Blood Groups
Group
Marker on cell
Antibody in
Serum
A
A antigen
Anti-B
B
B antigen
Anti- A
AB
A antigen and B
antigen
None
O
None
Anti -A and
Anti -B
Universal Donor- O
Universal Recipient-AB
Rh factor(rhesus)
 A different marker on the cells.
 If you are Rh + you have the antigen on your cells
 If you are Rh- no antigen present
Blood pressure
 Force exerted on arteries as ventricles contract
 Measured with sphyngmometer
 Normal blood pressure for an adult:
120 = Systolic pressure =
80
Diastolic pressure
ventricles contract
ventricles relax
Circulatory diseases
 Atherosclerosis- High blood pressure- Fatty deposits
(plaque) builds up on artery walls
 Heart attack- Blockage of blood vessels to the heart
 Stroke- Blockage of blood vessels to the brain