Homeostasis and blood

One substance that cells need to maintain a high concentration of is oxygen. What delivers oxygen to all of the individual cells of multicellular animals like humans?

• Transport Proteins

• Red Blood Cells

• Hormones

• The lungs

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Where do red blood cells pick up oxygen?

• The lungs

• All of the cells of the body

• The digestive system

• The mitochondria

When red blood cells move past the air sacs (alveoli) of the lungs, the red blood cells pick up oxygen. The high concentration of oxygen in the alveoli and low concentration of oxygen in the red blood cells allow for oxygen to move into the red blood cells via...

• simple diffusion

• facilitated diffusion

• active transport

• respiration

Oxygen enters the red blood cells (via simple diffusion) as they move past the lungs because oxygen moves from an area of _ concentration to an area of _ concentration

• low, high

• high, low

After the blood leaves the lungs, the red blood cells are carrying a lot of _. It is then pumped out of the lungs, out of the heart, through the blood vessels, and through the tiny capillaries that surround all cells of the body.

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When the red blood cells are near cells that have a low oxygen concentration, the oxygen will move...

• out of the red blood cells and into the body cells via simple diffusion

• out of the red blood cells and into the body cells via facilitated diffusion

• out of the red blood cells and into the body cells via active transport

• out of the red blood cells and into the body cells based on the amount of Carbon Dioxide (CO2) in those other cells

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All of the cells of your body need to maintain high oxygen concentration ...

• in order to perform cellular respiration (convert glucose energy into ATP energy)

• because cells can only perform their reactions in an aqueous environment

• because it balances out carbon dioxide

• so the red blood cells take oxygen from the body cells and deliver it to the lungs to be exhaled

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Homeostasis is also maintained by choices your brain makes. The brain is able to communicate with the rest of the body via the nervous system. This system relies on nerves sending chemical messages to each other and other tissues (like muscles). Which of these are forms of transport that the nervous system uses to send messages?

• Exocytosis

• Facilitated Diffusion

• Protein Pumping

• Osmosis

• All of these

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Your body needs to maintain glucose concentration in your cells. Glucose is sugar used by the cells for ___.

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As part of blood-sugar homeostasis, glucose needs to enter the cell. To do this the hormone ___ activates the cells so they can bring in glucose.

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