6.2 The blood system TOPIC 6 & 11: HUMAN & ANIMAL PHYSIOLOGY.
-
Upload
miles-morrison -
Category
Documents
-
view
223 -
download
2
description
Transcript of 6.2 The blood system TOPIC 6 & 11: HUMAN & ANIMAL PHYSIOLOGY.
6.2 The blood system
TOPIC 6 & 11: HUMAN & ANIMAL PHYSIOLOGY
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.
Blood Flow
UnidirectionalValvesOxygenated vs.
Deoxygenated Blood
Action of the Heart
Diastole: the heart muscle is relaxed.
Systole: the heart muscle is contracting.
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)
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 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.
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 - VESSELSRead & Consider 6.2.1-6.2.6
• What do you know?• What questions do you have?
Arteries & Veins
CapillariesCapillaries link
arteries to vein and in turn help to deliver oxygenated blood to body tissues.No muscleNo elastic tissueNo valvesOne cell layer thick
Coronary Heart Disease
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.