the heart Flashcards
1
Q
label the heart
A
2
Q
where is the heart located
A
between the lungs in centre of chest
3
Q
how is the heart structured and its function
A
composed of cardiac muscles, contract involuntarily, contains lots of mitochondria and myoglobin
cardiac muscle cells separated by intercalated disc, connected by gap junctions, enables electrical impulse to pass through tissue, synchronised contraction
4
Q
external features of the heart
A
enclosed in pericardium, tough fibrous sac, protects heart
5
Q
what is the left and right sides of heart separated by
A
septum
6
Q
what is the septum
A
wall of muscular tissue, ensure blood does not mix between left and right sides of heart
7
Q
how can valve be opened
A
blood pressure greater before valve
8
Q
what stops valve from inverting
A
tendious cords
