13.5 Circulatory system of a mammal

Question 1

Diffusion is adequate for transport over short distances. What is used for transport over larger distances?

Answer 1

A mass transport system.

Question 2

The lower the surface area to volume ratio and the more active the organism is, means a greater need for a specialised what?

Answer 2

A specialised transport system with a pump.

Question 3

Four features of a transport system?

Answer 3

• Suitable medium to carry minerals (e.g blood).
• A form of mass transport where the medium is moved around in bulk.
• A closed system of tubular vessels that distributes medium to all parts of organism.
• A mechanism for moving the transport medium within vessels. Requires pressure differences between the system (heart).
• A mechanism to maintain flow in one direction (valves).
• Means of controlling the flow to suit different needs of different parts of the organism.

Question 4

HEPATIC ARTERY flows oxygenated blood from the what to the what?

Answer 4

From Aorta to the LIVER.

Question 5

De-oxygenated blood flows BACK TO the heart in the what?

Answer 5

VENA CAVA (to right atrium).

Question 6

RENAL VEIN is coming from where?

Answer 6

The KIDNEYS.

Question 7

What joins the stomach and intestines to the liver?

Answer 7

HEPATIC PORTAL VEIN.