Exchanges of Substances with the Environment Random Retrieval

This quiz contains all the questions in the Exchanges of Substances with the Environment section. The website will pick 20 questions at random.

1 / 20

What happens to the heart during Diastole?

Atrial and Ventricular walls are relaxed, the Atrioventricular valve is closed.

Atrial and Ventricular walls are relaxed, and the Atrioventricular valve is open.

Atrial wall is relaxed, but the ventricular wall is contracted. The Atrioventricular valve is open.

2 / 20

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

The atria contract, increasing the pressure, and the Atrioventricular valve is closed.

The atria contract, reducing the pressure, and the Atrioventricular valve is closed.

The atria contract, increasing the pressure, and the Atrioventricular valve is open.

3 / 20

When will the valves close?

When the pressure is lower in front of the valve and higher behind it.

When the pressure is higher in front of the valve, and lower behind it.

When the pressure is equal.

4 / 20

Why can we not state using this data, CVD is caused by smoking?

Because P only = 0.006 for the linear trend.

Because the 95% Confidence Intervals overlap for two of the results.

Because CVD may have been caused by other things such as diet, exercise , age etc.

5 / 20

Which type of blood vessel has the widest lumen?

Atery

Vein

Arteriole

6 / 20

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

Artery

Vein

Aterioles

7 / 20

During the Bohr Effect, what happens to the affinity of haemoglobin for oxygen?

Lowers the affinity

Increases the affinity

It does not affect the affinity

8 / 20

What is a xerophyte?

A plant that has roots exposed to the air.

A plant that grows in low light intensities.

A plant the grows in areas with low water availability.

9 / 20

Which number represents a layer which is 2 or 3 times thicker in desert plants?

1

3

4

10 / 20

The diagram shows an insect respiratory system. Which letter represents the tracheoles?

A

B

C

D

11 / 20

The blood and water flow in opposite directions, what is this called?

Antagonistic System

Opposing System

Counter-current System

12 / 20

Using the diagram, which part is a lamella?

A

B

C

13 / 20

Using the diagram, which part is a gill filament?

A

B

C

14 / 20

Many species of fish have developed a technique to allow a constant flow of oxygenated water over the gills, even when stationary. This is called Buccal Pumping, how does it work?

The tongue lowers, increasing the volume in the mouth so water moves in. The mouth closes, the tongue then moves up, increasing the pressure and forcing the water out over the gill plates.

The tongue lowers, increasing the volume in the mouth so water moves in. The mouth closes, the fish then swallows the water.

The tongue moves down, increasing the volume in the mouth so water moves in through the opercula ( vents) , over the gill plates , and out through the mouth.

15 / 20

Sufferers of emphysema also have reduced elastin in the alveolar walls. What effect does this have on breathing?

Alveoli can't stretch so there is a reduced volume on inhalation.

Causes an increase in surface area due to 'baggy' alveolar walls.

Reduced Elastic recoil, so problems with exhaling.

Shorter diffusion pathway due to thinner walls.

16 / 20

Which muscles contract when you exhale at rest?

External Intercostal Muscles

Internal Intercostal Muscles

Diaphragm

None

17 / 20

Which two letters would be held open by C shaped cartilage rings?

B & C

C & D

D & E

E & F

18 / 20

Is it important which way round the numbers go when writing a ratio?

Yes

No

19 / 20

What is the surface area to volume ratio of a spongy mesophyll cell with the surface area of 24,000 µm ², and a volume of 110,000µm ³?

13.3 : 1

1 : 0.22

0.22 : 1

4.58 : 1

20 / 20

What is the volume of the same roughly spherical spongy mesophyll cell with a diameter of 80 µm, using the formula Volume=4/3 pi r ³?

2,144,661 µm³

2,144,660µm³

268,082 µm³

268,083 µm³

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