What is the function of a cell's nucleus?
The function of a cell's nucleus is to regulate all of the activities of a cell.
How do vacuoles in plant cells help keep the plant upright?
When a vacuole fills with water they push the cytoplasm against the cell walls which makes the plant upright.
What is the difference between diffusion and osmosis?
Osmosis involves materials crossing a membrane while diffusion does not. Osmosis always includes water but diffusion does not.
If you stand at one end of a room and spray perfume into the air, a person at the other end of the room will soon smell the perfume.Explain.
Particles of the perfume diffuse through the air until they are equally concentrated throughout the room. This is a demonstration of going from a small concentrated area to a larger less concentrated area.
How do the functions of red blood cells and white blood cells differ?
Red blood cells carry oxygen, and white blood cells fight infection.
In what way do the respiratory and circulatory systems work together?
The circulatory system carries the oxygen and carbon dioxide that are exchanged by the respiratory system.
What does the pancreas do?
The pancreas produces a fluid that neutralizes stomach acid and chemicals tjat help finish digestion.
Between the trachea and the esophagus is a flap of skin called the epiglottis. What do you think its function is?
The epiglottis closes off the trachea when food is swallowed.
What kinds of muscles move food through the digestive system?
Smooth muscles move food through the digestive system.
What kind of action is a sneeze caused by pepper in the air? Explain.
A sneeze caused by pepper is a reflex action. Reflex actions happen automatically.