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Date: ________________
Section 7.5: The Mammalian Heart



Main organ in the circulatory system
______________________ pump
Technically: _______ parallel pumps that are synchronized
 Separated by a thick wall of muscle (______________________)
Left Side
Right Side
Parts
Circulation
Type
Receives oxygenated blood from lungs
and sends to body tissues/cells
Circulation
Description
Receives deoxygenated blood from body
and sends to lungs
Hint
Heart Chambers
 Four ______________________ or “rooms” (2 atria and 2 ventricles)
Atria (Atrium)
Walls
Ventricles
Receive Blood from
Pump Blood
Round and @ top
Blood Flow in Heart
Into heart
Shape & Location
_______________
‘V’ shaped and @ bottom
_______________
Leaves heart
Heart Valves
 Prevents ______________________ of blood
 ______________________ valve found between artia & ventricles
 ______________________ valve found between ventricles and arteries
Major Veins & Arteries
Vena Cava
______________________,
which come into heart
- Superior vena cava comes from
______________________
- Inferior vena cava comes from
______________________
Type of Blood Vessel
Types
Aorta
______________________,
which go way from heart
- Aorta goes to
______________________
- Descending aorta goes to
______________________
Section 7.6: Setting the Heart’s Tempo


Heart composed of ______________________ muscle
o Muscles that contract without external nerve stimulation
Sinoatrial (SA) node
o Located where vena cava enter the ______________________
o Sends nerve impulse to AV node
o ______________________ contract
What’s a node?


Atrioventricular (AV) node
o Located at AV valve in right atrium
o Sends nerve impulse through septum to ventricles (through ______________________)
o ______________________ contract
Controlled by the ______________________ nervous system
Sympathetic
Parasympathetic
When used?
effect on heart rate

______________________ are electrical impulses displayed on a graph (Figure 3, page 260)
Section 7.7: Heart Sounds



lubb-dubb caused by ______________________
Diastole: ______________________ of heart
o Atria fill with blood & contract, AV valves ______________________
o Blood enters ventricles & contract, AV valves ______________________ = lubb
o Blood pushed into arteries through semilunar valves
Systole: ______________________ of heart
o Ventricles relax & increase in volume
o Blood drawn toward ventricles from arteries
o Semilunar valves ______________________ = dubb
o Blood stays in arteries
Section 7.8: Blood Pressure



Measured by a ______________________________ (a.k.a. blood pressure cuff)
Measures two pressures:
o When ventricles contract (______________________)
o When ventricles relax (______________________)
Varies by artery: ______________________ with distance from ventricles
Blood Pressure Regulation
1. Cardiac output:
 Any increase = ______________________ blood pressure
2. Arteriolar resistance/diameter:
 Constriction (more blood in artery) = ______________________ blood pressure
 Dilation (less blood in artery) = ______________________ blood pressure
 If CO2 & lactic acid build-up during ______________________
o Smooth muscles relax & arterioles ______________________
o Delivers more ______________________ to tissues
Blood Pressure Problems
Too Low
Too High
Problems
Figure 3,
page 265
Adjustment