Table of Contents
What substances are transported by?
What substances are transported in the blood?
|Oxygen||Lungs||All the body’s cells|
|Carbon dioxide||All the body’s cells||Lungs|
|Glucose||Digestive system||Liver, then all the body’s cells|
What substances are transported in active transport?
Substances transported by active transport are sugars, most amino acids, organic acids, and a number of inorganic ions, such as sulfate, phosphate, and potassium.
What substances pass through transport proteins?
Water molecules and ions move through channel proteins. Other ions or molecules are also carried across the cell membrane by carrier proteins. The ion or molecule binds to the active site of a carrier protein. The carrier protein changes shape, and releases the ion or molecule on the other side of the membrane.
What are the three types of transport across the cell membrane?
Basic types of membrane transport, simple passive diffusion, facilitated diffusion (by channels and carriers), and active transport.
How are Substances transported in the blood stream?
Transport of substances in blood. Oxygen is absorbed in the lungs from fresh air which has been breathed in. Red blood cells (erythrocytes) contain the rotein haemoglobin which can reversibly combine with oxygen. In the lungs, where the concentration of oxygen is high, haemoglobin will take up oxygen and form oxyhaemoglobin.
How are molecules transported into and out of a cell?
Molecules can move into or out of cells by diffusion and active transport. Cells can gain or lose water by osmosis. All cells are enclosed by a cell membrane. This structure has two layers, and is represented in the diagram below.
Which is an example of passive and active transport?
Cartoon representing passive transport as rolling a boulder down a hill and active transport as rolling a boulder up a hill. Diffusion is the movement of particles down their gradient.
Are there substances that do not travel in the blood?
There is another substance that can act as a respiratory pigment. This is myoglobin. It does not travel in the blood but is found in muscle. It has a greater affinity for oxygen than haemoglobin and so only releases oxygen at very low partial pressures.