HBS 3.4.4: Water Balance

The kidneys have the following function(s)

• exchanging gases from the body and external environment

• providing the body with the materials needed to generate energy

• filtering excess water, solutes, and other wastes from the bloodstream

• keeping pathogens in check so they do not over take the body

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Diffusion is the motion of molecules...

• that keeps the molecules on one side of a container

• that leads to the molecules never really spreading out

• from an area of low concentration to a high concentration

• from an area of high concentration to a low concentration

When you sweat, you lose water and salts from your body. If you only drink water after and do not replenish the salts in your body, we can predict that your body cells will

• increase in volume

• decrease in volume

• stay the same

• become sad

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The dialysis tubing shown models the function of which cell organelle?

• cell membrane

• mitochondrion

• cell wall

• cytoplasm

When the level of salt in your blood is high, what will happen to your body cells in response?

• Salt will diffuse into your body cells from the blood, leading them to shrink

• Salt will diffuse out of your body cells into the blood, leading them to swell

• Water will diffuse out of your body cells into the blood, leading to them to shrink

• Water will diffuse into your cells from the blood, leading them to swell

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The function of the excretory system is to

• assist in movement of the muscles

• bring important gases into and out of the body

• remove wastes from the body

• breakdown large food macromolecules into their subunits

This is an image of a selectively permeable membrane. This term means

• only certain kinds of molecules can pass through the membrane

• all molecules can freely pass the membrane

• only the largest molecules can pass the membrane

• the size of the molecule has no impact on whether or not it will pass

The differences between diffusion and active transport are (choose 2 answers)

• active transport involves the movement of molecules while diffusion does not

• active transport requires energy (ATP), while diffusion does not

• diffusion requires energy (ATP), while active transport does not

• diffusion is movement from a high to a low concentration, while active transport moves in the opposite direction

Which of the following is NOT a role of the urinary system?

• Conserve water

• Eliminate toxins

• Maintain proper salt levels

• Absorb nutrients into the blood

What may be a problem is someone has excessive and very dilute urine due to the patient being very hydrated, but normal blood pressure?

• ADH deficient

• ADH excess

• Aldosterone deficient

• Aldosterone excess

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