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 term is used to describe the 'sticking' together of water molecules?

Cohesion

Tension

Mass Flow

2 / 20

The evaporation of water molecules out of the leaf, 'pulls' the water molecules behind up. What is this 'pull' called ?

Cohesion

Tension

Mass Flow

3 / 20

Which of the following is a way a high salt content in your diet increases your risk of developing CVD?

Salt reduces the water potential of the blood, so water moves out of the endothelium cells via osmosis, causing them to shrivel.

Salt reduces the water potential of the blood, causing water to move in from surrounding tissues via osmosis, leading to an increase in blood pressure, and development of an atheroma.

Salt reduces the water potential of your blood, causing the red blood cells to crenate and form blood clots.

4 / 20

What is a Thrombosis?

A blood clot that forms in the lumen when the lining of an artery becomes damaged.

A blood clot that forms under the endothelium when an artery becomes damaged.

Swelling caused by highblood pressure.

5 / 20

Cardiac Output ( CO) = Stroke Volume (SV) X Heart Rate ( HR). What is the cardiac output of an athlete with a SV of 95 cm³ , and a HR of 52 bpm?

4.94 dm³ hr^-1

4940 dm³ min^-1

4.94 dm³ min^-1

6 / 20

What happens during Ventricular Systole?

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

Atrial wall is relaxed, but the ventricular wall is contracted. The Atrioventricular valve is open, but the Semi Lunar valves are closed.

Atrial and ventricular walls are contracted, and the Atrioventricular valve is closed. The Semi Lunar valves are open.

7 / 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.

8 / 20

Which type of blood vessel has the widest lumen?

Atery

Vein

Arteriole

9 / 20

Once blood leaves arteries, which type of blood vessel will it enter?

Veins

Arterioles

Capillaries

10 / 20

If Carbon Dioxide concentration increases, which letter shows the direction the curve will shift?

C

D

Neither

11 / 20

Where in a human, is the affinity of haemoglobin for oxygen the highest?

Veins

Respiring Muscles

Percentage

12 / 20

What term describes the haem groups which contain iron?

Co-factor

Prosthetic Group

Active Site

13 / 20

Haemoglobin is a quaternary protein, how many polypeptide chains make up a single molecule of haemoglobin?

2

3

4

14 / 20

Why do the guard cells become 'curved' when they swell up?

Because the water fills them up.

Because the cell wall next to the stoma is thicker.

Because the internal cytoskeleton bends.

15 / 20

What maintains the concentration gradients for gaseous exchange in the tracheoles?

Abdominal Pumping.

Respiration in the body tissues.

Abdominal pumping and respiration in the body tissues.

16 / 20

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

Antagonistic System

Opposing System

Counter-current System

17 / 20

What is the function of the lamellae?

To maintain a concentration gradient over the whole filament.

To reduce the diffusion pathway.

To increase the surface area.

18 / 20

Which muscles contract during forced expiration?

External Intercostal Muscles

Internal Intercostal Muscles

Diaphragm

None

19 / 20

Which is an example of a behavioural adaptation which allows an animal to live at hotter temperatures?

Having enzymes with a higher optimum temperature.

Finding shade.

Thin, coarse hair or scales.

Small size.

20 / 20

How have multicellular organisms adapted to not being able to absorb everything via diffusion over their surface?

A Transport System

Exchange Systems

Transport and Exchange Systems

Moving to maintain a concentration gradient.

Your score is

0%

Recent Posts

Categories