Cells carry out chemical reactions that are essential for organism survival. The substance needed for the reactions have to get into cells and waste products removed from the cells.
Which of these substances would diffuse into a human cell?
Which organ system is involved in providing the bloodstream with glucose?
Which organ filters urea out of the blood?
Which component of blood transports oxygen?
Red blood cells
What does a partially permeable membrane mean?
All substances can cross the membrane
No substances can cross the membrane
Only certain substances can cross the membrane
Which of these animals would have the smallest surface area to volume ratio?
What is the name of the blood vessel that takes blood from the heart to the lungs?
What is the surface area to volume ratio if a multicellular organism has a surface area of 200 cm2 and a volume of 500 cm3 ?
What is active transport?
The net movement of molecules from a high concentration to a low concentration
The net movement of water molecules from a high concentration to a low concentration across a partially permeable membrane
The net movement of molecules from a low concentration to a high concentration, using energy
Why do veins and the heart have valves?
To resist high pressure
To prevent backflow of blood
To resist low pressure