Circulatory Systems in Animals (Grade 10 NSC Matric Life Sciences): Flashcards
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Circ. system where blood flows freely in body cavities
Circ. system where blood flows freely in body cavities
Open circulatory system
Circ. system where blood stays within vessels
Circ. system where blood stays within vessels
Closed circulatory system
No. of heart chambers in fish (single circulation)
No. of heart chambers in fish (single circulation)
Two (one atrium, one ventricle)
Times blood passes through heart in double circulation
Times blood passes through heart in double circulation
Twice per complete circuit
Type of blood carried by pulmonary artery
Type of blood carried by pulmonary artery
Deoxygenated blood
Four chambers of the heart
Four chambers of the heart
L & R atrium, L & R ventricle
Duration of one cardiac cycle at rest
Duration of one cardiac cycle at rest
0.8 seconds
Heart's natural pacemaker
Heart's natural pacemaker
Sinoatrial node (SA node)
Key structural difference: arteries vs veins
Key structural difference: arteries vs veins
Arteries: thick walls; Veins: thin walls with valves
Wall structure of capillaries
Wall structure of capillaries
Single layer of endothelial cells