Date post: | 01-Jan-2016 |
Category: |
Documents |
Upload: | gil-gallegos |
View: | 13 times |
Download: | 0 times |
20-2
Size, Shape, Location of the Heart
• Size of a closed fist• Shape
– Apex: Blunt rounded point of cone
– Base: Flat part at opposite of end of cone
• Located in thoracic cavity in mediastinum
Fig. 22.2
20-4
External Anatomy• Four chambers
– 2 atria– 2 ventricles
• Auricles• Major veins
– Superior vena cava– Inferior vena cava– Pulmonary veins
• Major arteries– Aorta– Pulmonary trunk
Fig. 22.5
20-6
Heart Valves• Atrioventricular
– Tricuspid– Bicuspid or mitral
• Semilunar– Aortic– Pulmonary
• Chordae tendineae• Papillary muscles
Fig. 22.6
20-7
Heart Valves
Tricuspid valves
Bicuspid valves
Aortic semilunar valves
Pulmonary semilunar valves
20-11
Review Question
Damage to the mitral valve could result in an inefficient flow of blood from the _____________ to the _________________.
(a) Pulmonary trunk to right ventricle(b) Right atrium to right ventricle(c) Left ventricle to aorta(d) Right ventricle to left ventricle(e) Left atrium to left ventricle
20-14
Points to RememberPoints to Remember• Heart is size of a closed fist and located in
mediastinum beneath rib cage• Heart is enclosed in pericardium with
pericardial fluid• Heart has four chambers: two atria and two
ventricles• Valves control flow of blood within and out
of heart• Heart is part of dual circuits for flow of
blood - systemic and pulmonary