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biology IGCSE > transport in animals > Flashcards

transport in animals Flashcards

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1
Q

what does the circulatory system do?

A

provides oxygen and nutrients to the different parts of the body and removes carbon dioxide and other waste material

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2
Q

the circulatory system consists of:

A
  • a pump (the heart) to keep the blood moving
  • blood vessels to carry the blood
  • valves to make sure that the blood flows in one direction only
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3
Q

the 3 types of blood vessels

A

arteries, veins and capillaries

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4
Q

2 types of circulation

A

single circulation
eg. in fish, where: heart → gills → rest of the body → heart
- double circulation
eg. in humans, where: heart → lungs → heart → rest of the body → heart

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5
Q

advantages of double circulation

A

higher pressure, therefore;
- The greater the flow of blood
- The further the blood can travel in the body

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6
Q

the heart is divided into two halves by a…

A

septum

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7
Q

the upper chamber is called an…

A

atrium

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8
Q

the lower chamber is called a…

A

ventricle

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9
Q

blood is pumped away from the heart in…

A

arteries

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10
Q

blood returns towards the heart in…

A

veins

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11
Q

where are semi-lunar valves found?

A

found at the exits of the heart

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12
Q

what do semi-lunar valves prevent?

A

blood flowing back from arteries to ventricles

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13
Q

where are atrioventricular valves found?

A

found between the atrium and the ventricle

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14
Q

what do atrioventricular valves prevent?

A

blood flowing back from ventricles to atria

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15
Q

the walls of the _____ are thicker than the walls of the _____

A
  1. ventricles
  2. atria
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16
Q

why are the walls of the ventricles thicker than the walls of the atria?

A
  • The thickness of the wall chamber is proportional to the amount of force the chamber must generate.
    • The atria only pumps blood to the ventricle, therefore not a lot of force must be generated
    • The ventricles, however, must pump blood to the rest of the body, so they need to generate more force
17
Q

why are the walls of the left ventricle thicker than the walls of the right ventricle?

A

the right ventricle only pumps blood to the lungs, whilst the left ventricle has to pump blood all the way up to the head (against gravity) and all the way down to the toes (long distance), so it needs to generate a greater force

18
Q

actions in a heartbeat (5)

A
  1. Blood flows from veins into the atria
  2. The atria contract, pushing blood to the ventricles
  3. The atrioventricular valves close due to the fall in pressure in the atria
  4. The ventricles contract, pushing blood to the arteries
  5. The semilunar valves close due to the fall in pressure in the ventricles
19
Q

what does coronary heart disease refer to?

A
  • refers to the disease that arises when the coronary arteries are unable to supply oxygen rich blood to the heart muscles due to blockages in them
  • The blockages decrease the diameter of the coronary arteries, making it difficult for blood to pass through
20
Q

risk factors for CHD

A
  • age
  • diet
  • genetic predisposition (whether or not there is a family history of CHD)
  • gender
  • smoking
  • stress
21
Q

arteries characteristics

A

small lumen, thick walls, oxygen-rich blood, high pressure

22
Q

capillaries characteristics

A

very small lumen, very thin walls, blood cells flow in a single file

23
Q

veins characteristics

A

large lumen, thin walls, valves, deoxygenated blood, low pressure

24
Q

to the heart

A

pulmonary vein (from lungs)
vena cava (from the body)

25
Q

from the heart

A

pulmonary artery (to lungs)
aorta (to the body)

26
Q

to the lungs

A

pulmonary artery

27
Q

from the lungs

A

pulmonary veins

28
Q

to the kidney

A

renal artery

29
Q

from the kidney

A

renal vein

30
Q

4 components of blood

A
  • Plasma: a watery fluid which transports red blood cells, ions, soluble nutrients, hormones and carbon dioxide in the blood
  • Platelets - clotting
  • White blood cells
  • Red blood cells
31
Q

white blood cells

A
  • Part of the body’s immune system
  • They can either destroy pathogens (phagocytosis carried out by phagocytes) or produce antibodies (lymphocytes)
32
Q

formation of a blood clot

A
  • Blood plasma contains fibrinogen (a soluble protein) which circulates in the body
  • The platelets at the injury site release a substance which converts the soluble fibrinogen into insoluble fibrin
  • The fibrin comes together in threads to form a mesh around the site of injury
  • This mesh traps the red blood cells and platelets, forming a blood clot
  • The blood clot dries, forming a scab

biology IGCSE (22 decks)

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