6.2 The blood system TOPIC 6 & 11: HUMAN & ANIMAL PHYSIOLOGY.

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Presentation transcript:

6.2 The blood system TOPIC 6 & 11: HUMAN & ANIMAL PHYSIOLOGY

1- THE HEART BEATS Read & Consider What do you know? What questions do you have? Label a diagram of the heart and indicate the flow of blood with arrows.

Blood Flow Unidirectional Valves Oxygenated vs. Deoxygenated Blood

Action of the Heart Diastole: the heart muscle is relaxed.

Systole: the heart muscle is contracting.

No Brain Required Myogenic: the heart beat is initiated by the heart muscle itself. It does not require external nerve input. Sino-atrial node (SA node) – pacemaker Atrio-ventricular node (AV node)

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

Autonomic Nervous System Medulla 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.

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

2 - VESSELS Read & Consider What do you know? What questions do you have?

Arteries & Veins

Capillaries Capillaries link arteries to vein and in turn help to deliver oxygenated blood to body tissues. No muscle No elastic tissue No valves One cell layer thick

Coronary Heart Disease

Works Cited Delfino, Mona. "Sacred Language of the Human Body - Waking Times « Waking Times." Waking Times. N.p., 14 Jan Web. 11 Aug Kelly, Miles. "HUMAN BLOOD VESSELS- ILLUSTRATION." HUMAN BLOOD VESSELS- ILLUSTRATION. Foto-Libra, 27 July Web. 11 Aug Walpole, Benda. Biology for the IB Diploma. Second ed. United Kingdom: Cambridge UP, Print. "William Harvey." William Harvey. Library of Congress, n.d. Web. 11 Aug

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