HUMB1000 Lecture Notes - Lecture 6: Extracellular Fluid, Blood Vessel, The Fluid
19 Jun 2018
School
Department
Course
Professor
Transports fluids, nutrients, waste products, gases, and
hormones throughout the body.
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Exchange materials between blood, cells and extracellular fluid.
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Plays a role in the immune response, blood pressure and the
regulation of body temperature.
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Consists of the heart, blood vessels,
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Why do we need a CVS
Humans are multicellular
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Cells around the body all need a constant supply of oxygen and
nutrients, and constant removal of waste products.
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We need a circulating fluid for transportation.
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Exchange materials between blood, cells and extracellular fluid
(interstitial fluid).
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Blood and blood vessels.
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Capillaries - exchange
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Transport:
Generating blood pressure –moves blood through vessels.
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Routing blood: separates pulmonary and systemic circulations.
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Pump:
Cardiovascular System
Friday, 20 April 2018
9:04 PM
Cardiovascular Page 1
Cardiac output (ml/min) = heart rate (beat/min) x stroke volume
(ml/beat)
CO= HR x SV
A longer-term increase in SV is achieved with a training effect, which
is why athletes can have a lower resting HR but still have adequate
CO
Cardiac Output
Tuesday, 17 April 2018
1:32 PM
Cardiovascular Page 2
The cardiac cycle, or heartbeat is the sequence of events that occur in one complete beat of the heart.
Systole- pumping phase of the cycle, when the heart contracts
Diastole- filling phase of the cycle as the heart muscle relaxes
For a short time, both the atria and ventricles are in diastole. During this phase, the atria fill with blood and the ventricles
also receive blood as the valves between them are open.
Atrial systole- the contraction of the atria then follows and forces the remaining blood into ventricles
Ventricular systole- relaxed atria which are being filled while the ventricles contract pumping blood into the arteries.
Highest blood pressure- ventricular systole
Lowest blood pressure- ventricular diastole
The heart contains specialized conductive tissue which regulates heartbeat
The sinoatrial node (SA node or pacemaker) is cluster of specialised cardiac cells in the wall of the right atrium which
initiates the heart beat. It is under the control of the medulla oblongata in the brain. When a nerve impulse reaches the SA
node, the atria will contract. The SA node then sends its own impulse to the AV node.
The atrioventricular node (AV node) is the secondary pacemaker which regulates the beating of the ventricles.
Medulla oblongata> SA node> AV node
Cardiac Cycle
Monday, 11 July 2016
5:48 PM
Cardiovascular Page 3
Document Summary
Transports fluids, nutrients, waste products, gases, and hormones throughout the body. Exchange materials between blood, cells and extracellular fluid. Plays a role in the immune response, blood pressure and the regulation of body temperature. Cells around the body all need a constant supply of oxygen and nutrients, and constant removal of waste products. Exchange materials between blood, cells and extracellular fluid (interstitial fluid). Cardiac output (ml/min) = heart rate (beat/min) x stroke volume (ml/beat) A longer-term increase in sv is achieved with a training effect, which is why athletes can have a lower resting hr but still have adequate. The cardiac cycle, or heartbeat is the sequence of events that occur in one complete beat of the heart. Systole- pumping phase of the cycle, when the heart contracts. Diastole- filling phase of the cycle as the heart muscle relaxes. For a short time, both the atria and ventricles are in diastole.
