The Heart And Physiology Flashcards
Where’s the apex of the heart?
It’s in between the fifth intercostal space
What vein does deoxygenated blood enter the heart?
Superior and inferior vena cava
What does the pulmonary trunk do?
Takes deoxygenated blood back to the lungs.
What is the Pulmonary veins?
Brings oxygenated blood back to the left atrium
What is an Aorta?
Takes oxygenated blood to the body
What is the fluid that surrounds the heart called?
Pericardial space
What order does the Pericardium go in starting from inside to out?
- Parietal serous
- Fibrous
- Visceral serous
- Visceral serous
- Parietal serous
- Fibrous
What is the Fibrous pericardium for?
Consists Fibrous tissue and prevents over stretching of the heart
What is the Myocardium?
Is a specialised cardiac muscle.
How does the Myocardium send an impulse and why?
The impulse is initiated and then spread from cell to cell through the branches and discs to let the whole heart contract is an co-ordinated and efficient manner.
In the endocardium is the layer single or double epithelium?
It is a single layer.
What is the endocardium for?
It is a very smooth membrane that minimises friction as the blood flows over it.
Which ventricle works harder?
The Left as the right is a low pressure system.
What’s a cardiac myocyte?
The heart cells
What does cardiac mysocytes all ow by depolarisation?
Allow Ca2+ ions to enter and cause contraction.
Is the change in electrical charge within myocytes spontaneous or strategic?
Spontaneous.
What is Systole?
It is ventricular contraction.
What is Diastole?
Ventricular relaxation?
Do cells in the myocardia have parasympathetic or sympathetic innervation? Para= decrease HR/ Sym= increase HR
Sympathetic
