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water
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What molecule can diffuse from the digestive tract into the human blood stream without first being digested?
Alcohol (ethanol) can diffuse from the digestive tract into the bloodstream without being digested. This is why alcohol can quickly enter the bloodstream and reach the brain, leading to its effects on the central nervous system.
When a substance wants to enter the cell it binds to what?
When a substance wants to enter a cell it goes through the cell membrane in a process called endocytosis.
Identify at least five ways by which a substance may enter the cell?
A substance can enter a cell through diffusion, facilitated diffusion, active transport, endocytosis, or passive transport. Each of these processes has different mechanisms for moving substances across the cell membrane.
What substance may seep into an organisms remains and replace it's hard parts?
Any foreign substance that can enter an organism by diffusion can seep into an organism and replace its hard parts.
What substance cannot be moved into a cell by osmosis or diffusion?
Large molecules such as proteins cannot be moved into a cell by osmosis or diffusion due to their size and charge. These molecules require specialized transport mechanisms such as active transport to enter the cell.
How is digested food carried to your cells?
The digested food is in form of glucose which is broken down in mitochondria to release energy.
How does gases enter and leave capillaries?
Simple diffusion.
What type of diffusion helps glucose enter the cell?
facilitated diffusion
What can enter a cell by diffusion?
a gas?
Where does digested food enter your blood?
The small intestine
How are diffusion and facilitated diffusion similar?
Substances enter a cell through the cell membrane
If a substance is smoked how long does it take to enter the urine?
It takes 30 days without OJ.
