6.2 the blood system topic 6 & 11: human & animal physiology
DESCRIPTION
Blood Flow Unidirectional Valves Oxygenated vs. Deoxygenated BloodTRANSCRIPT
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6.2 The blood system
TOPIC 6 & 11: HUMAN & ANIMAL PHYSIOLOGY
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1- THE HEART BEATSRead & Consider 6.2.6-6.2.12
• What do you know?• What questions do you have?• Label a diagram of the heart and indicate the
flow of blood with arrows.
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Blood Flow
UnidirectionalValvesOxygenated vs.
Deoxygenated Blood
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Action of the Heart
Diastole: the heart muscle is relaxed.
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Systole: the heart muscle is contracting.
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No Brain RequiredMyogenic: the heart beat is initiated by
the heart muscle itself. It does not require external nerve input.Sino-atrial node (SA node) – pacemakerAtrio-ventricular node (AV node)
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Myogenic Contraction
Gardenrain.com
SA node – generate an impulse that spread across both atria causing a simultaneous contraction. ≈ 70 bpm
AV node – picks up the SA signal which travels to the apex and contracts the ventricles from the bottom up.
Heartbeat
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Autonomic Nervous SystemMedulla Oblongata
Cardio-acceleratory center – linked to the SA node increase cardiac output.
Cardio-inhibitory center – linked to the SA node, AV node and bundle of His decrease cardiac output.
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Epinephrine (adrenaline)A hormone that travels through the
transport system to the SA node. Epinephrine increases the rate which the SA node resets, therefore increasing heart rate.
Decibel-design.com
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2 - VESSELSRead & Consider 6.2.1-6.2.6
• What do you know?• What questions do you have?
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Arteries & Veins
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CapillariesCapillaries link
arteries to vein and in turn help to deliver oxygenated blood to body tissues.No muscleNo elastic tissueNo valvesOne cell layer thick
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Coronary Heart Disease
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Works CitedDelfino, Mona. "Sacred Language of the Human
Body - Waking Times « Waking Times." Waking Times. N.p., 14 Jan. 2014. Web. 11 Aug. 2014.
Kelly, Miles. "HUMAN BLOOD VESSELS-ILLUSTRATION." HUMAN BLOOD VESSELS-ILLUSTRATION. Foto-Libra, 27 July 2005. Web. 11 Aug. 2014.
Walpole, Benda. Biology for the IB Diploma. Second ed. United Kingdom: Cambridge UP, 2014. Print.
"William Harvey." William Harvey. Library of Congress, n.d. Web. 11 Aug. 2014.