2/6/08 the heart chapter 18. 2/6/08 the heart heart function = key factor in body function health...
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2/6/08
The Heart
Chapter 18
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The HeartHeart function = key factor in body functionHealth Issues – Heart problems are one of the leading
causes of death in the US
Primary function♦Blood circulation♦There must be enough force generated to send blood to
every single cellAs A Pump
♦Pumps 1835 gallons of blood a day♦Through 60,000 miles of blood vessels
What’s your heart doing right now?
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Heart - LocationRemember those body cavities….?Mediastinum = the cavity between the lungs
♦Holds•Trachea•Thymus•Pericardial cavity
Inside the pericardial cavity…♦Heart + Pericardium
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Fig. 18-1
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Fig. 18-1
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Heart - Anatomy Chambers
♦Atria♦Ventricles
Arteries♦Pulmonary♦Aorta♦Coronary
Veins♦Pulmonary♦Vena Cava♦Coronary
Valves♦Atrioventricular♦Semilunar
Conduction Nodes (electrical) & Fibers Fig. 18.3
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2/6/08
Heart - Anatomy Chambers
♦Atria♦Ventricles
Arteries♦Pulmonary♦Aorta♦Coronary
Veins♦Pulmonary♦Vena Cava♦Coronary
Valves♦Atrioventricular♦Semilunar
Conduction Nodes (electrical) & Fibers Fig. 18.3
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2/6/08
Heart - Anatomy Chambers
♦Atria♦Ventricles
Arteries♦Pulmonary♦Aorta♦Coronary
Veins♦Pulmonary♦Vena Cava♦Coronary
Valves♦Atrioventricular♦Semilunar
Conduction Nodes (electrical) & Fibers Fig. 18.6
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2/6/08
Heart – Anatomy: ChambersThere are 3 layers of tissue
♦Epicardium = visceral layer♦Myocardium = cardiac muscle♦Endocardium (innermost) = squamus epithelium (thin layer)
Fig. 18.4
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2/6/08
Heart – Anatomy: ChambersThere are 3 layers of tissue
♦Epicardium = visceral layer♦Myocardium = cardiac muscle♦Endocardium (innermost) = squamus epithelium (thin layer)
♦Thickness of the myocardium is variable♦It’s made of cardiac muscle – do you recall any special
features of cardiac muscle?
♦Intercalated discs…♦How does that relate to cell function?♦Coordinated action potential for contraction
Fig. 18.6
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Heart – Anatomy: Cardiac muscle
Fig. 18.5
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Heart – Anatomy: Chambers
Fig. 18.6
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Heart – Anatomy
Fig. 18.7
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Heart – Anatomy: Chambers
Fig. 18.7
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Heart – Anatomy
Fig. 18.8a
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Heart – Anatomy: Chambers
Fig. 18.8b
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Heart – Anatomy: Chambers
Fig. 18.9
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Heart – Anatomy: Chambers
Fig. 18.9
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Heart – Anatomy
Fig. 18.6
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Heart – Anatomy
Fig. 18.6
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Heart – Anatomy
Fig. 18.6
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Fig. 17-10