Lesson 2B P2 Flashcards
Alveoli how many cells thick
1
Where are the alveoli
At the end of the smallest airways
How many alveoli absorb oxygen from air
300 million
What is in close contast to alveoli
Pulmonary arteries and veins
Where do the pulmonary arteris branch from
Trunk off the base of the right ventricle
Where do the pulmonary pulmonary veins course to
The left atrium of the heart
How many pulmonary veins are there
4 (2 FROM EACH LUNG)
How is flow in the arteries maintained throughout diastole
Ventricles contract through out systole forcing expansion of vessel wall
Potential energy is stored in the wall
Aortic valve closes in the heart and starts diastole
Walls recoilc to release the stored potential energy
This recoil forces blood to continue forward motion - thus keeping blood pressure
What is ventricular systole
Period of contraction of the heart
Causes injection of blood into the aorta and pulmonary trunk
How long does ventricular systole last
0.-0.4 seconds
___-___ cc of blood leaves the ventricle with each contraction
80-100cc
What is aterial blood pressure peak
120mmHg
When does atrial systole occur
Towards the end of the ventricular diastole
How does atrial systole complete
By filling of the ventricles
During atrial systole both ______ contract simultaneously
Ventricles
What is diastole
Period of time when the heart (atria) refills with blood after systole contraction
What is ventricular diastole
It is the period during which both ventricles are relaxing (filling with no contraction)
What is atrial diastole
The period during which the atria are relaxing (filling)
Both atria are in diastole at the same time
The ascending aorta leaves the heart from
Left ventricle
The ascending aorta is dived into what segments
Ascend, arch , descening
The first major branch of ascending aorta
Left and right coronary artery
The thoracic aorta suplies (6)
Pericardium Mediastinum Diaphragm Esophagus Bronchi Intercostal muscles
3 arteries from celiac trunk
Hepatic, left gastric, splenic arteries
SVC function
Carries deoxygenated blood from upper half of the body to the rt atrium
The _______ vein drains into the SVC just prior to the right atrium
Azygos
The aygos veins serves as
Collateral pathway as it connect the SVC and IVC
