M:3 S:2 The Heart
Transport in Animals
- Created by: JessicaMPascoe
- Created on: 14-03-19 11:30
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- The Heart
- External Structure
- Diagram
- Internal Structure
- Diagram
- Valves
- Prevent the backflow of blood
- AV valves links the atria to the ventricles
- Valves stop the blood from flowing back into the atria when the ventricle pressure increase
- Bicuspid
- Left
- Tricuspid
- Right
- Semi lunar valves
- Aortic
- Pulmonary
- QUESTIONS
- 2. Which chamber of the heart receives blood from the lungs
- 1.
- a. Which part of the cardiac cycle graph shows ...
- ii. The atrioventricular valve closing?
- i. The semi lunar valve opening?
- b. Explain the cardiac cycle
- a. Which part of the cardiac cycle graph shows ...
- Cardiac Cycle
- Graph
- 1. Ventricles relax, atria contract
- a. Atria pressure ^ and vol decreases
- b. Forces blood through AV valves into ventricles
- c. Slight increase in V pressure and vol as they receive blood
- ATRIAL SYSTOLE
- 2. Ventricles contract, atria relax
- a. Vol decreases in V's and pressure ^
- b. Pressure ^ in V than A, so AV valves shut
- c. Pressure in V causes semi lunar valves to open
- d. Blood forced into pulmonary artery and aorta
- VENTRICULAR SYSTOLE
- 3. Ventricles relax, atria relax
- a. ^ pressure in PA and aorta = SL valves close
- DIASTOLE
- b. Atria fill with blood = pressure ^
- Due to ^ pressure in vena cava and pulmonary vein
- c. As ventricles relax, pressure falls below atria
- AV valves open and blood flows passively into ventricles from atrira
- 'Passively' = without contraction
- AV valves open and blood flows passively into ventricles from atrira
- Cardiac Output
- Vol of blood pumped by the heart per minute
- HR x stroke vol
- Stroke Vol = Vol of blood pumped during each HB
- HR x stroke vol
- Vol of blood pumped by the heart per minute
- Dissection
- Diagram
- External Structure
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