Cardiovascular System
No description yet. This curated deck is ready for daily study.
Card preview (24)
What does the circulatory system consist of?
Heart, blood, arteries, capillaries, veins, venules
What is the role of the heart?
To pump blood around the body
What is the heart made of?
Cardiac muscle
What is the the anatomy of the heart?
4 Chambers, right atria and ventricle and left atria and ventricle. with valves between the chambers.
How long does one heart beat last?
0.8 Second
How long does systole last?
0.3 seconds
How long does diastole last?
0.5 seconds
What happens during systole?
Both ventricles contract, blood ejected from heart.
What happens during diastole?
Blood flows from atria into ventricles
Define myogenic
Can contract without receiving nervous stimulation from the central nervous system.
What are the 4 places called that controls the contractions within the heart?
Sino Atrial node, Atrioventricular node, bundle of his and purkinje fibres
Where is the Sino atrial node and what does it do?
Located in the right atrium and sets the pace of heartbeats. It sends nervous impulse to both atria and both atria contract at the same time.
Where is the atrioventricular node and what does it do?
Located at the bottom of the right atrium. Delays action potential whilst atria contract.
Where is the bundle of His located and what does it do?
The middle of the heart that separates the chambers and this is where the electrical impulses spread down to the ventricles.
Where is the Purkinje fibres and what does it do?
At the base of the heart and spreads the impulse across the ventricles.
What is the Autonomic Nervous system controlled by?
Medulla
Can the Autonomic Nervous System override the Sino atrial node?
Yes
What can the Medulla release to act on the Sino atrial node?
Hormones
What does adrenaline do to the heart?
Speeds up heart rate
What does acteylcholine do to the heart?
slows heart rate down
What is anticipatory rise?
Where the heart speeds up out of the anticipation of exercise.
Why does the heart need to speed up during exercise>
To transport and delivery of nutrients. To transport oxygen from lungs to muscles. Also transports glucose, fats and amino acids and removes the lactic acid and carbon dioxide.
Muscles produce what at the start of exercise?
CO2 and Lactate
What receptor detects the lactate and CO2 in the blood?
Chemoreceptors