4 functions of the heart
generates blood pressure
ensures one way blood flow because of valves
regulates blood supply
What is the size of the heart?
A closed fist
What is the shape of the heart?
Apex -- blunt rounded point of cone
Base -- flat part of opposite end of the cone
What is the location of the heart?
The central core of the thoracic cavity in the mediastinum
What is the pericardium?
the sac around the heart
What are the two parts of the pericardium
fibrous and serous
describe the fibrous
tough, fibrous outer layer
describe the serous
thin, transparent, inner layer, simple squamous epithelium
What are the two parts of the serous layer
parietal -- lines the fibrous outer layer
visceral -- covers heart surface
What is between the two layers in the pericardium
a pericardial cavity with pericardial fluid
What are the three layers of tissue in the heart?
epicardium, myocardium, endocardium
serous membrane, smooth outer surface of heart
lining of the heart
What two great vessels of the heart go into the heart?
inferior vena cava and superior vena cava
what two great vessels of the heart leave the heart
aorta and pulmonary trunk
Which ventricle does the aorta leave from?
Which ventricle does the pulmonary trunk leave from?
What vein goes into the heart in the left atrium
What are the three smaller vessels of the heart
What do the smaller vessels do?
provide blood supply for the heart
How many atriums are there?
what do the atria do?
receive blood from outside the heart
Is the atria made up of thick or thin muscle?
Does the atria produce high or low pressure?
How many ventricles are there?
what do the ventricles do?
pump blood out of the heart
Are ventricles made up of thick or thin muscle?
Do ventricles produce high or low pressure?
What do valves do?
How many cuspid valves are there and what is another name for them?
Two and atroventricular valves
What is found between the right atrium and right ventricle?
What is found between left atrium and left ventricle?
What is found between right ventricle and pulmonary trunk?
right semilunar valve
What is found between left ventricle and aorta
left semilunar valve
Know the cardiac pathway
What conducts action potential
What is the order of how nerve impulses fire?
right and left bundle branches
What is another name for the sinoatrial node