Factors Affecting The Cardiovascualr System L8 Flashcards
(15 cards)
What factors affect the cardiovascular system
⚫️ sudden arrhythmic death syndrome (SADS)
⚫️ High blood pressure / low blood pressure
⚫️ Hyperthermia / hypothermia
What is arrhythmia
A condition in which the heart beats with an irregular or abnormal rhythm.
In what ways can you attempt to restart the heart.
CPR
Defibrillators
Medications/ drugs
Cardiac pacing
What will happen is there is too much pressure on the heart and arteries?
High blood pressure
Strains the heart and damages the blood vessels ( too much pressure on arteries)
What is cardiac arrest?
SA node (pacemaker does not fire impulses resulting in the heart shutting down)
What is the role of a defibrillator?
Sends electrical shock to the heart
Temporarily stops all electrical activity in the heart
Allows hearts natural pacemaker a chance to reset and start a normal rhythm
How can exercise trigger cardiac arrest?
Exercise increases the hearts workload and oxygen demand.
Any underlying heart condition like blocked arteries can cause the heart to malfunction suddenly leading to cardiac arrest.
How is cardiac arrest different to a heart attack?
Cardiac arrest is when the heart stops beating
Heart attack happens when blood flow to part of the body is blocked causing an irregular heart beat (not fully stopped beating)
How can high blood pressure result in a heart attack?
Puts strain on your blood vessels and other organs/ heart.
High cholesterol levels can block arteries blocking blood and causing a heart attack.
What are coronary arteries?
Arteries that supply oxygenated blood to the heart.
What is systolic pressure?
Measured when the heart contracts?
What is diastolic pressure?
Measured when the heart relaxes
Why do we turn blue when experiencing hypothermia?
Blood goes to vital organ rather than surface of skin as vital organs needs protecting.
Vasodilation
The widening/ relaxation of blood vessels
Increase blood flow and lowers blood pressure
Occurs when the muscles in the vessel walls relax allowing more blood to pass through.
Vasoconstriction
Narrowing of blood vessels
Caused by the contraction of muscles in their walls
This reduces blood flow and raises blood pressure
