Transcript The Cardiovascular System

The Cardiovascular
System
Cardiovascular System
Function: transportation
 Blood in the transport vehicle
 Carries oxygen, nutrients, cell wastes,
hormones and other substances

Anatomy of the Heart
Size of your fist
 Weigh about a pound
 Pointed bottom in the apex
 Flatter top is the base

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These are all transported by the
circulatory system except…
1. Oxygen
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2. Nutrients
3. Carbon
4. Wastes
Coverings

Pericardium- serous membrane
– Visceral pericardium- part of heart wall,
tight
– Parietal pericardium, loose anchors heart

Myocardium– thick muscles actually contracts

Endocardium
– Thin, lines the chambers of the heart
Chambers

Atria
– Receiving chambers
– Fill with blood from veins
– Send blood to ventricles
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Myocardium could be
considered to be part of which
other system?
1. Respiratory
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2. Excretory
3. Muscular
4. Integumentary
Chambers continued

Ventricles
– Pumping chambers
– Thick walls
– Contract to push blood through arteries
Pulmonary Circuit
Pump
Right atria and ventricle of the heart
 Superior and inferior venae cavae
bring back oxygen poor blood
 Right ventricle sends oxygen poor
blood to the lungs through pulmonary
arteries

Ventricles push blood
into…
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Veins
Arteries
Venae Cavae
The Brain
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Whole Body Circuit
Pump
Left side atria and ventricle
 Oxygen rich blood from lungs comes
into LA and is moved to the LV
 The LV then pumps the blood out the
aorta to the rest of the body

Valves

Atrioventricular (AV) valves- prevents
blood from back flowing into atriums
– Bicuspid-left AV
– Tricuspid- right AV
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Relaxed when filling closed during
contraction
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What color would the blood be
in the Left Atria?
1. Scarlett
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2. Dull red
3. Black
4. Purple
Valves cont

Semilunar valves prevent backflow into
ventricles
– Pulmonary- right side
– Aortic – left side
Cardiac Circulation

Coronary arteries
– Provide oxygen and blood to the
myocardium

Coronary veins
– Bring back oxygen poor blood to the right
atrium
On the the way out…
Pulmonary Artery- out of right ventricle
 Aorta- out of left ventricle
 Arteries- blood leaving the heart
 Arterioles- small vessels carry blood
away from the heart

At the tissue…

Capillaries
– Network of tiny vessels in the tissue
– Drop off oxygen and nutrients
– Pick up waste products
On the way back…
Pulmonary vein- brings back blood
from the lungs to the left atrium
 Vena Cavae- brings back blood to right
atrium from body
 Veins- large vessels bringing blood
back
 Venule- small vessels ringing back
blood

All blood returns to the
heart through…
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Arteries
Veins
Aortas
Capillaries
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