The aortic valve, which is located between the left ventricle and the aorta, functions to (1 point)
push blood forward toward the lungs.
add oxygen to blood.
filter the blood.
prevent blood from flowing backward.

23. the structures that contain membranes across which oxygen and carbon dioxide diffuse are the (1 point)
bronchi.
bronchioles.
vocal cords.
alveoli.

The aortic valve, which is located between the left ventricle and the aorta, functions to  ' prevent blood from flowing backward'.

The structures that contain membranes across which oxygen and carbon dioxide diffuse are the 'alveoli'.

question: which statement best describes the different properties of metals?

answer: they are shiny and bend without breaking.

since metals have certain characteristics properties, they include the following: they are ductile, malleable, shiny, hard, lustrous, flexible and they are good conductor of heat and electricity. so therefore, metals are not dull and they are not non-flexible as listed. instead, they are shiny and flexible.

hope this , have a good day. c;