3.2 Circulatory Systems Flashcards Preview

A Level Biology > 3.2 Circulatory Systems > Flashcards

Flashcards in 3.2 Circulatory Systems Deck (27)
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1
Q

Single called organisms are able to get everything through what?

A

Simple diffusion across their membrane

2
Q

Single celled organisms have what features meaning they can rely on simple diffusion?

A

Small
Large sa:v
Low metabolic rate

3
Q

Multicellular organisms have what features:

A

Large
Small sa:v
High metabolic rate
Active

4
Q

Multicellular organisms need a transport system for what reasons?

A
Metabolism 
Small sa:v
Hormones
Digestion
Waste products
5
Q

Why do multicellular organisms need a transport system due to metabolism?

A

High oxygen and glucose demands

Diffusion distance too large to supply these by simple diffusion

6
Q

Why do multicellular organisms need circulatory systems due to small sa:v?

A

Makes diffusion distance large

Simple diffusion would be too slow

7
Q

Why do multicellular organisms need transport systems for hormones?

A

To take them from where they are made to where needed

8
Q

Why do multicellular organisms need transport systems for digestion?

A

To take glucose from digestive system to where needed

9
Q

Why do multicellular organisms need transport systems due to high metabolic rate?

A

Lots of waste products that need to be carried away from respiring cells

10
Q

What are features of all circulatory systems?

A

Liquid transport medium
Vessels
Pumping mechanism

11
Q

What is mass transport?

A

When substances are transported in a mass fluid around the body with a mechanism for moving he fluid

12
Q

(Single) where are single circulatory systems found?

A

Fish

13
Q

(Single) blood passes through the heart how many times for each complete circuit of the body?

A

Once

14
Q

(Single) in fish the heart pumps blood to where?

A

The gills to pick up oxygen

Rest of body to deliver oxygen

15
Q

(Open) what is a feature of an open circulatory system?

A

Blood not always enclosed in vessels

16
Q

(Open) what type of animal has open systems?

A

Invertebrates

17
Q

(Open) in insects the heart pumps what through vessels?

A

Hemolymph

18
Q

(Open) what does hemolymph carry?

A

Food
Waste
WBCs

19
Q

(Open) hemolymph leaves vessels at what pressure?

A

Low

20
Q

(Open) hemolymph is pumped into the haemcoel which is what?

A

The body cavity

21
Q

(Open) in the body cavity hemolymph is in direct contact with what?

A

Tissues and cells

22
Q

(Open) in insects hemolymph returns to the heart through what?

A

Valves

23
Q

(Closed) what is a feature of closes circulatory systems and where are they found?

A

Blood enclosed in vessels

Invertebrates

24
Q

(Double) blood passes through the heart how many times for a complete circuit of the body?

A

Twice

25
Q

(Double) what does the pulmonary system do?

A

Sends deoxygenated blood from the heart to the lungs

Oxygenated blood from lungs back to heart

26
Q

(Double) the systemic system sends what?

A

Oxygenated blood to body

Deoxygenated back to heart

27
Q

(Double) why is the double system more efficient?

A

Blood gets extra push

Travels faster and gets to tissues quicker

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