CV System - Regulation of Heart Responses Flashcards
what is the definition of stroke volume SV
The volume of blood that leaves the heart during each contraction
What is the unit for cardiac output
L / Min or Ml / Min
What is the equation of cardiac output
HR X SV
what is the definition of cardiac output
The amount of blood The heart pumps out per minute
what would the difference be between an a trained person and untrained persons resting heart rate
Trained Individuals Resting HR are much lower than untrained individuals
why is a trained person resting heart rate lower than untrained person
cardiac hypertrophy -> heart is bigger -> pumps more blood -> larger SV ->increased size of chambers -> bigger SV -> heart doesn’t have to beat as many times
What is the sympathetic system
A part of the autonomic nervous system that speeds heart rate
What is the Parasympathetic System
A part of the autonomic nervous system that decreases heart rate
What is the medulla oblongata
The most important part of the brain as it regulates processes that keep us alive such as breathing and heart rate
What is the ANS
Autonomic nervous system
What does the ANS do
Determines the rate at which the SAN sends out impulses
How does the sympathetic nervous system increase HR
It releases adrenaline
What does adrenaline increase in the sympathetic nervous system
It increases the strength of ventricular contraction which then increases stroke volume
In the sympathetic nervous system what does noradrenaline do
Aids the spread of electrical impulse throughout the heart, increasing HR
In the sympathetic nervous system what does an increased metabolic rate cause
Increased CO2 and lactic acid, decrease in blood PH (more acidic)