Anatomy and Physiology: Cardiovascular Dynamics
PHYSIOEX 3.0 EXERCISE 33: CARDIOVASCULAR DYNAMICS
Objectives
1. To define the following: blood flow; viscosity; peripheral resistance; systole; diastole; end diastolic volume; end systolic volume; stroke volume; cardiac output. 2. To explore cardiovascular dynamics using an experimental setup to simulate a human body function.
3. To understand that heart and blood vessel functions are highly coordinated.
4. To comprehend that pressure differences provide the driving force that moves blood through the blood vessels.
5. To recognize that body tissues may differ in their blood demands at a given time. 6. To identify the most important factors in control of blood flow.
7. To comprehend that changing blood vessel diameter can alter the pumping ability of the heart.
8. To examine the effect of stroke volume on blood flow.
_____________________________________________________________
The physiology of human blood circulation can be divided into two distinct but remarkably harmonized processes: (1) the pumping of blood by the heart, and
(2) the transport of blood to all body tissues via the vasculature, or blood vessels. Blood supplies all body tissues with the substances needed for survival, so it is vital that blood delivery is ample for tissue demands.
The Mechanics of Circulation
To understand how blood is transported throughout the body, let’s examine three important
factors influencing
how blood
circulates
through
the
cardiovascular system: blood flow, blood pressure, and peripheral resistance.
Blood flow is the amount of blood moving through a body area or the entire cardiovascular system in a given amount of time. While total blood flow i s determined by cardiac output (the amount of blood the heart is able to pump per minute), blood flow to specific body areas can vary dramatically in a given time period. Organs differ in their requirements from moment to moment, and blood vessels constrict or dilate to regulate
Objectives
1. To define the following: blood flow; viscosity; peripheral resistance; systole; diastole; end diastolic volume; end systolic volume; stroke volume; cardiac output. 2. To explore cardiovascular dynamics using an experimental setup to simulate a human body function.
3. To understand that heart and blood vessel functions are highly coordinated.
4. To comprehend that pressure differences provide the driving force that moves blood through the blood vessels.
5. To recognize that body tissues may differ in their blood demands at a given time. 6. To identify the most important factors in control of blood flow.
7. To comprehend that changing blood vessel diameter can alter the pumping ability of the heart.
8. To examine the effect of stroke volume on blood flow.
_____________________________________________________________
The physiology of human blood circulation can be divided into two distinct but remarkably harmonized processes: (1) the pumping of blood by the heart, and
(2) the transport of blood to all body tissues via the vasculature, or blood vessels. Blood supplies all body tissues with the substances needed for survival, so it is vital that blood delivery is ample for tissue demands.
The Mechanics of Circulation
To understand how blood is transported throughout the body, let’s examine three important
factors influencing
how blood
circulates
through
the
cardiovascular system: blood flow, blood pressure, and peripheral resistance.
Blood flow is the amount of blood moving through a body area or the entire cardiovascular system in a given amount of time. While total blood flow i s determined by cardiac output (the amount of blood the heart is able to pump per minute), blood flow to specific body areas can vary dramatically in a given time period. Organs differ in their requirements from moment to moment, and blood vessels constrict or dilate to regulate