Lecture Exam 3 - 34J) Lymphatic System & 34K) Gas Exchange in Respiratory System

Question 1

• What is the Lymphatic system consisting of?

Answer 1

Vessels-nodes separate from the circulatory system

Question 2

• What does Lymphatic system HELP with?

Answer 2

Returns certain items (proteins) back to the blood stream

Question 3

• So what does “Lymph” in itself mean?

Answer 3

Recovered fluid going back into the circulatory system

Question 4

• Then what is the “Lymph Nodes” themselves?

Answer 4

They are small filtering organs that contain white blood cells

Question 5

• Partial pressure, it helps drive what?

Answer 5

(Diffusion especially in the mixture of diffusion)

Question 6

• In Respiratory Media, what is 30X smaller than air?

Answer 6

H2o is 30x smaller than air so there is a lot less Oxygen in water “partial pressure”

Question 7

• When thinking of the plasma membrane of gas exchange cells in contact with aqueous solution – what should come to mind?

Answer 7

Remember how an Amoeba has to have a moist/aqueous environment in order to survive for Diffusion to readily happen

Question 8

• So with sponges, cnidarians and flatforms, does simple diffusion enter into the body wall? What is released? Does it have to be moist?

Answer 8

Yes – it must be moist. It does enter the body, O2 in and Co2 out as well

Question 9

• Do most animals have a respiratory organs that are thin/moist epithelium?

Answer 9

Yes – in fact ours as humans is no different from that.

Question 10

• Skin respiratory organ must be what and under dense network of blood vessels?

Answer 10

Must be moist w/mucus – especially considering it will be under Capillaries in order for Diffusion to happen

Question 11

• The folds in gills are examples of increasing the surface area when speaking of what?

Answer 11

when speaking of the Alveolus and the Bronchioles, etc

Question 12

• The Gills help to suspend in water to help increase what?

Answer 12

The folds – which help to increase the surface area

Question 13

• How does Countercurrent Exchange help exchange heat? (So there is this exchange of heat and gases along with diffusion happening to increase the efficiency of diffusion – watch a video?

Answer 13

So there is this exchange of heat and gases along with diffusion happening to increase the efficiency of diffusion – watch a video?

What I understand from the video: as the water moves into the gills of the fish, the fish is extracting say for example, 20ppmo2 of Oxygen from the water - which is diffused in the blood. In other words, the fish must maintain so much of Oxygen in the water to maintain it’s equilibrium down it’s concentration gradient for diffusion to happen.