How does the interface between the air and blood in the lungs work?
What will be an ideal response?
The respiratory airways, which carry air from the outside into the lungs, branch extensively when they reach the lungs. Tiny air sacs cluster at the ends of the huge number of airway branches. Similarly, the vessels carrying blood into the lungs branch extensively and form dense networks of small vessels that encircle each air sac. This tremendous interface is crucial for the lungs' ability to efficiently carry out their function: the transfer of needed oxygen from the air into the blood and the unloading of the waste product carbon dioxide from the blood into the air. The greater the surface area available for these exchanges, the faster O2 and CO2 can move between the air and the blood.
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Which of the following is not true of either the transverse cervical or suprascapular arteries?
A) typically arises from the thyrocervical trunk B) typically passes anterior to scalenus anterior C) supplies the cords of the brachial plexus D) occasionally arises from the third part of the subclavian artery E) provides blood to the deltoid
Spinae muscles control bending bending at waist, and are powerful extensors to return body to erect position.
a. true b. false
The heart is called a double pump because ________
A) it is two separate side-by-side pumps serving different circulations B) blood flows into the receiving chambers, which pump it to the muscular chambers that pump it again for distribution C) every chamber has a strong pumping action D) blood is sent from one pump that imparts a small pressure directly into a second pump that imparts higher pressure
How many autosomes pairs do humans have?
A) 22 B) 11 C) 23 D) 1