Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
7 Cards in this Set
- Front
- Back
|
Describe the main difference between close and open systems of circulation? |
-Unlike closed systems, open circulatory systems do not have a complete Circuit of vessels for A blood to pass through from the heart to the body and back again. Closed Systems blood always remains within vessels.
|
|
|
Why don't all animals have an open system? |
An open system remains slow at a lower pressure, active animals need a rapid supply. |
|
|
a)Describe where the blood flows to immediate s after it has passed through the gills in a fish? b) relate this to pressure at which the blood flows in a systematic circulation |
a)Blood returns to the heart after the lungs. b) blood flows to the heart at a low pressure. |
|
|
Describe where the blood flows immediately after it has passed through the lungs in a mammal? b) relate this to pressure at which the blood flows in a systematic circulation. |
A)Blood returns to the heart. b) blood flows at a higher pressure |
|
|
Explain the higher functional efficiency of double Circuit system, Relative to a single circuit system. |
By passing blood back to the heart's from the Lungs, the double circuit system is able to maintain high blood pressures throughout the body. Higher Systematic pressures are important for efficient oxygen delivery. |
|
|
Hearts range from being simple contractile Chambered organs, to complex chamber organs, describe the basic heart structure in fish/mammals? |
-The fish heart is a single pump. Blood flows from the atrium to the ventricle. -the mammalian heart is a double pump with two atria and two ventricles separated by a muscular septum, one pump send blood to the lungs, the other sends blood to the body. |
|
|
Explain how a closed system gives an animal finer control over the distribution of blood to tissues and organs: |
Bloodflow within the vessels can be regulated by the contraction or relaxing of blood vessel walls. This enables animals to restrict blood flow in some areas and increase it in others in response to need. |
