Download Circulatory System Chapters 17, 18, 19

Circulatory System
Chapters 17, 18, 19
• Plasma consists of :
– 92% water, 8% solutes - mostly proteins (albumin,
globulins (antibodies), fibrinogen), hormones, gasses
(CO2, O2), nutrients (glucose), wastes (urea, ammonia).
• Serum is fluid left after plasma clotting proteins are
removed.
• 45% Formed (cellular) elements. – all formed in the red marrow,
short lived in circulation.
• Consists of:
– < 1% buffy coat (wbc and platelets) between plasma and rbcs.
– Leukocytes - White Blood Cells - primarily function to defend
against foreign bodies (bacteria, viruses, foreign proteins, etc).
– Platelets (Thrombocytes) - cytoplasmic fragments. Help stop
blood flow by forming a platelet plug.
• 45% RBC (hematocrit- estimate of rbc mass).
• Erythrocytes - Red Blood Cells 99%+ of formed
elements of blood.
Time to Draw!
Lungs
Pulmonary circuit
Systemic circuit
Body Tissues
oxygen poor
oxygen rich
Lungs
Pulmonary circuit
Systemic circuit
Body Tissues
oxygen poor
oxygen rich
Lungs
Right atrium
Left atrium
Right ventricle
Left ventricle
Pulmonary circuit
Systemic circuit
Body Tissues
oxygen poor
oxygen rich
Pulmonary vein
Lungs
From RV
Right atrium
Left atrium
Superior
Vena Cava
Inferior
Vena Cava
Atrioventricular
valve - tricuspid
Right ventricle
Left ventricle
To lungs
Atrioventricular valve
– bicuspid or mitral
Aortic semilunar valve
Aorta
To body
Pulmonary artery
Pulmonary
semilunar valve
Body Tissues
oxygen poor
oxygen rich
myocardium
endocardium = endothelium
Epicardium = visceral
pericardium
Interventricular septum
CHORDAE TENDONAE - Tendon-like cords connect pointed ends and undersurfaces
of AV flaps to papillary muscles attached to inner surface of ventricle.
PAPILLARY MUSCLES - Contract as ventricles contract. Keeps AV flaps from everting
back into atria, and stops backflow into atria.
The Pacemaker and Conduction System of the Heart
Intra-atrial path
Sinoatrial node
Right atrium
Left atrium
Atrioventricular
bundle (of His)
Atrioventricular
node
Right ventricle
Left ventricle
Left and Right
bundle branches
Conduction myofibers
(purkinje)
CORONARY ARTERIES - arise from small
openings (aortic sinus) just above aortic
semilunar valve.
Arteries form an upside down crown around
about the heart.
CORONARY VEINS - Generally travel with
arteries. Drain into right atrium by way of
coronary sinus.
CORONARY SINUS- When cardiac veins
join together on posterior side of heart they
form a sinus which drains into the right
atrium.