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28 Cards in this Set

  • Front
  • Back
Functions of the heart
-propels O2, Co2, nutrients, blood, and waste
-routes blood
-generates blood pressure
-ensures 1 way blood flow
Characteristics of the heart
-size of a fist and weighs less that 1lb
-between lungs in thoracic cavity
-apex(bottom) towards left side
Pericardium - double layered sac that anchors and protects the heart

Parietal Pericardium - membrane around heart's cavity

visceral Pericardium - membrane on heart's surface

pericardial cavity - space around the heart
Layers of the heart
epicardium - surgace of the heart (outside)

myocardium - thick, middle layer cardiac muscle

Endocardium - smooth inner surface
Cardiac Muscle
-1 centrally located nucleus
-rich in mitochondria (energy)
-Intercalated disks - cell connections that allow it to beat as a unit
Chambers and blood vessels
-4 chambers - LV RV LA RA

-Coronary sulcus - separates atria from ventricles

-Cornary arteries - suppy blood to the wall of the heart
-located in the upper portion

-holding chambers (blood)

-Small, thin walled chambers

-Contract minimally to push blood into ventricles

-Interatrial septum - seperates the right and left atria
-lower portion
-pumping chambers
-thick, strong walled
-contract forcefully to propel blood out of the heart
-interventricular septum: seperates right and left ventricles
Right side of the heart
Pulmonary circuit - carries blood from the heart to lungs

-blood is 02 poor and co2 rich
Right atrium
-recieves blood from three places: superior and inferior vena cava and coronary sinus

-superior vena cava: drains blod above diaphram (head, neck, upper limbs)
inferior vena cava
drains blood from below the diaphram (abdominopelvic cavity and lower limbs)
cornary sinus
drains blood from mycardium
Right Ventricle
Opens into the pulmonary trunk
Pulmonary Trunk
splits into pulmonary arteries
Pulmonary Arteries
carry blood away from heart and lungs
Left side of the heart
systemic circuit - carries blood from the heart to the blody
Left Atrium
4 openings (pulmonary veins) that recieve blood from lungs
Left Ventricle
Opens into aorta
carries blood from the LV to the body
-structures that ensure 1 way blood flow
Atrioventicular Valves (AV)
between Atria and Ventricles
Bicuspid valve
AV valve betwen LA and LV
-2 cusps
Semilunar Valves
pulmonary semilunar- found at base of pulmonary trunk
aortic semilunar
found at base of the aorta
Chordae tendineae
attached to AV valve flaps and support valves
What happens when the Bicuspid Valve is open?
-blood flows from the LA and into the LV
-the aortic semilunar valve is closed
-Tension on the chordae tendineae is low
What happens when the Bicupsid Vlave is closed?
-blood flows from the LV into the Aorta
-Aortic semilunar valve is open
-Tension on chorae tendineae is high
Blood flow through the heart
1) RA
2) Tricuspid Valve
3) RV
5) Pulmonary Semilunar Valve
6) Pumonary Trunk
7) Lungs
8) Pulmonary veins
9) LA
10) Bicuspid Valve
11) LV
12) Aortic semilunar valve
13) Aorta
14) Body