Heart Rate Flashcards
1
Q
what does it mean the heart muscle is myogenic?
A
Creates its only electrical impulses and not just reliant on the nervous system
2
Q
What is intrinsic rhymicity?
A
The ability for cells to beat together.
3
Q
where is the cardiovascular centre?
A
In the brain
4
Q
what is the cardiovascular centre?
A
controls if the body requirements changed the heart needs to speed up or slow down controlled by nerves
5
Q
How is the heart beat controlled?
A
- specialised cells in the SAN control action potential around 70 times each minute
- the membrane around the node, allows a charge to be maintained across the membrane
- at rest the node is polarised
- when contraction occurs the node is polarised
- positively charged ions move into the node stimulating the production of an electrical impulse
6
Q
what does it mean the node is polarised?
A
the cells inside the node are negatively charged in comparison to the outside.
