Exchanges of Substances with the Environment Random Retrieval

Which of the following is an example of a 'sink' ?

Which of the following is an example of a 'source' ?

What has happened at position A?

What is the stroke volume of a patient if their cardiac output is 3500 cm³ min^-1, and their heart rate is 70 bpm?

One of the phases of the cardiac cycle is called Atrial Systole. During Atrial Systole, what is happening in the heart during this phase?

Name the structures labelled B

Name the structures labelled A

This bar chart shows the risk of CVD with differing amounts of cigarettes smoked per day. Is there a significant difference in risk between smoking no cigarettes, and smoking 1 - 19 cigarettes a day?

As blood moves away from the heart, it travels in which type of blood vessel?

What do we call the arteries which supply the heart muscle?

In which direction ( if any) , would the curve be for human foetal haemoglobin?

How does water move into the guard cells?

Which number represents a stoma?

Which letter is the tracheae?

Using the diagram, which part is a gill filament?

Which letter represents the diaphragm?

Cresol red is an indicator which goes clear at a low pH. A plate of agar jelly with cresol red added was made, and two blocks were cut out. Block A measured 10mm x 10mm x 10mm. Block B measured 20mm x 7mm x 7mm. Are the two agar blocks a similar surface area (within 5% difference)?

Other than surface area to volume ratio, which is an example of a physiological adaptation, which allows an animal to live at colder temperatures?

Some animals are adapted to higher temperatures in their environment. Which of the following is an example of this ?

Multicellular organisms cannot absorb enough substances by diffusion. Why is this?