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Need to know the name of cardiac muscle
- Sinoatrial (SA) Node
- Atriventricular (AV) Node
- AV Bundle (bundle of His)
- Purkinje fibers
What does AV node do?
located in the right atrial wall near the center of the heart. As the electrical impulse spreads through the atria, they are signaled to contract.
What does SA node do?
Impulse for normal heart contractions is initiated. located in posterior wall of the right atrium.
branch of ANS originates centrally in a region of the brain stem called the medulla oblongata. Reaches heart through Vagus Nerve. decrease in heart rate
another branch of ANS....increases the rate of impulse generations and conduction speed. increase in heart rate.
exerts its effect through norepinephrien and epinephrine released by adrenal medulla.
What does endocrine system do to heartrate
it increases heartrate and contractibility.
What is a heart murmur
an extra or unusual sound heard during a heartbeat. Narrow valve or backflow towards atria through a leaky valvue.
Know what an ECG is
Electrocardiogram- a test that checks for problems with the electrical activity of your heart
atrial depolarization and occurs when the electrial impulse travels from SA node through the atria to the AV node.
ventrical depolarization and occurs as the impulse spreads from AV bundle to Purkinje fibers and through ventricals
ventrical repolarization, atrial repolarization cannot be seen because it occurs during QRS complex aka ventrical depolarization.
What is an arrhythmia?
A condition in which the heart beats with an irregular or abnormal rhythm.
Abnormally slow heart action.
Muscular twitching involving individual muscle fibers acting without coordination.
what is tachycardia
An abnormally rapid heart rate.
Pressure exerted by the blood on the vessle walls. Recommended BP is 120 systolic /80 diastolic
distribution of blood during rest
the most metabolic active tissues recieve the greatest blood supply.....liver and kidneys recieve half the blood. Feeding on essentials
distribution of blood during exercise
blood is redirected to the areas where needed most. muscles recieve up to 80 percent or more. increase cardiac output.
venus return of blood
muscle pump-contraction of skeletal muscles
what are the role of valves in veins?
the flow of blood back to the heart
squeezes veins in legs to assist in the return of blood to the heart. Circulation.
valvues allow blood to flow in only one direction, thus preventing back flow and pooling of the blood in the lower body.
Total blood volume
composed of plasma and formed elements. 3.5 liters for female and 5 for male. Larger blood volumes = greater lean body mass and high levels of endurance training.
normal blood vol for hematocrit
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