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Biology Paper 1 > Organisation > Flashcards

Organisation Flashcards

1
Q

give the definition for tissue

A

a group of similar cells working together to carry out a particular function

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2
Q

give the definition for organs

A

a group of tissues working together to perform a specific function

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3
Q

give the definition for an organ system

A

a group of organs that work together to form whole organisms

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4
Q

what is an enzyme

A

a biological catalyst
- *something that speeds up the rate of reaction without being changed or used up in the reaction

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5
Q

what is the lock and key method?

A

every enzyme has a substrate that fits perfectly with it

  • once the enzyme is in place, the enzyme and substrate bind together to form a substrate-enzyme complex; the reaction takes place rapidly; the products are released from the surface of the enzyme; enzyme is free to use again
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6
Q

what are the three digestive enzymes?

A

carbohydrase enzymes, protease enzymes, lipase enzymes

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7
Q

what is an example of a carbohydrase enzyme?

A

amylase

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8
Q

what does a carbohydrase enzyme break down?

A

carbohydrates (starch)

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9
Q

what does starch break down into?

A

simple sugars

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10
Q

where is amylase found?

A

salivary glands, small intestine, pancreas

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11
Q

what do protease enzymes break down?

A

proteins

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12
Q

what do proteins break down into?

A

amino acids

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13
Q

where is protease found?

A

stomach, small intestine, pancreas

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14
Q

what do lipase enzymes break down?

A

lipids

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15
Q

what do lipids break down into?

A

glycerol and fatty acids

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16
Q

where is lipase found?

A

small intestine, pancreas

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17
Q

what are the two roles of bile?

A

NEUTRALISES the stomach’s ph 2 into a ph 7.5 ready for enzymes made in the pancreas and small intestine

EMULSIFIES large molecules of lipids into smaller pieces of lipids (droplets) so the enzymes have a larger surface area to work with

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18
Q

how is the small intestine adapted to gas exchange? (4)

A
  • covered in millions and millions of villi which increase the surface area
  • villi covered in microvilli which further increases the surface area
  • villi has a network of capillaries = good blood supply
  • villi have a thin membrane = ensures a shorter diffusion path
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19
Q

what is the route the blood takes through the heart? (6)

A
  • de-oxygenated blood comes back to the heart through the vena cava
  • passes through the right atrium, through the tricuspid valve and into the right ventricle
  • leaves the heart through the pulmonary artery to go to the lungs
  • oxygenated blood returns to the heart through the pulmonary vein
  • passes through the left atrium, through the bicuspid valve and into the left ventricle
  • leaves the heart through the aorta to be taken to the body cells

repeats

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20
Q

what is the purpose of the coronary arteries?

A
  • to provide oxygen to the muscle cells of the heart
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21
Q

how is resting heart rate naturally controlled?

A

a group of cells in the wall of the right atrium that act as a pacemaker, they send electrical impulses to the muscle cells of the heart so that it contracts

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22
Q

what is an artificial pacemaker?

A

can be inserted beneath the skin and has a wire leading to the heart that sends the electrical impulses to the muscle cells

23
Q

in what case would an artificial pacemaker be needed?

A

if the group of cells in the atrium aren’t working and someone has an irregular heartbeat

24
Q

what are the features of an artery? (3)

A
  • thick walls to support the high pressure blood
  • small lumen
  • thick layer of elastic fibres that expand and spring back into place when there’s surges of blood
25
what are the features of a vein? (3)
- relatively thin walls because the blood is only at low pressure - large lumen - valves to stop back flow of blood
26
what are the features of a capillary? (3)
- walls one-cell thick to allow for a faster rate of the diffusion of gases - walls are permeable - narrow lumen
27
how are red blood cells adapted for carrying oxygen? (3)
- **biconcave shape** gives it a larger surface area to speed up the diffusion of oxygen into it - **no nucleus** gives it more space for the oxygen to fill - **contains haemoglobin** which binds to oxygen to create oxy-haemoglobin that can then be carried to the body tissues
28
what is plasma? (4)
- 90% water - carries virtually everything in the body - carries waste products like urea + carbon dioxide - can be separated from the other components of blood using a centrifuge
29
what are platelets?
tiny fragments of cells that help blood to clot in the face of an injury
30
what are white blood cells? (2)
- fight infection by creating antibodies - contain a nucleus with dna that codes the instructions the white blood cells need to do their jobs
31
what is chd?
**coronary heart disease** where the coronary arteries that supply blood to the muscles of the heart get blocked by layers of fatty material
32
how can chd cause a heart attack?
blocking the coronary arteries means reducing the flow of blood through them which results in a lack of oxygen for the heart muscle this results in a heart attack, where the heart is starved of oxygen
33
how can stents be used to help chd?
stents can be inserted into a coronary artery to stretch it open and restore and maintain blood flow
34
how can statins help with chd?
statins are drugs that help to lower the cholesterol by lowering its production in the liver the ‘bad’ cholesterol in the blood is what makes the fatty material that causes coronary heart disease
35
what are the advantages (3) and disadvantages (3) of using stents?
ADVANTAGES - *recovery after surgery is usually quick; lower the risk of a heart attack; effective for a long time* DISADVANTAGES - *risk of complications during the operation; risk of infection from the surgery; thrombosis (a blood clot around the stent)*
36
what are the advantages (3) and disadvantages (2) of using statins?
ADVANTAGES - *reduces chances of a stroke, chd, and heart attacks; increase ‘beneficial’ cholesterol; may prevent other diseases* DISADVANTAGES - *have to take the drugs regularly and so the body can start to rely on them; effect isn’t immediate*
37
what are the two types of artificial valve?
mechanical valve biological valve
38
why might an artificial heart be better than a donor heart?
an artificial heart is less likely to be rejected by the patient because it’s made from metal/plastic that the body won’t see as foreign and attack it in the same way it would with living tissues in a donor heart
39
why might an artificial heart be worse than a donor heart? (4)
- surgery to fit it can lead to bleeding and/or infection - parts of the heart could wear out or the electrical motor could fail - blood doesn’t flow as smoothly, possibly causing blood clots - patients have to take drugs to ensure this won’t happen, which can cause problems with bleeding if they’re hurt
40
how are the lungs adapted for gas exchange? (3)
- millions of alveoli give them a large surface area - alveoli have thin walls to shorten the path for diffusion - alveoli surrounded with capillaries which means they have a good blood supply
41
what produces a tumour?
uncontrolled cell division and mitosis
42
what are the two types of tumour?
benign malignant
43
what is a benign tumour? (3)
- growths of abnormal cells which are found in one area - contained within a cell membrane - benign cells do not invade other parts of the body
44
what does a malignant tumour do? (3)
- cells invade neighbouring tissues - cells move into the bloodstream - cells are transported through the bloodstream and invade other healthy tissues in the body
45
what do malignant tumours form?
secondary tumours
46
examples of cancers that link to lifestyle: (4)
**smoking:** lung cancer **obesity:** bowel, liver, and kidney cancer **uv exposure:** skin cancer **viral infection:** liver cancer
47
how are communicable diseases spread?
pathogens
48
what are the different types of pathogens? (4)
- bacteria - viruses - fungi - protists
49
what are the three ways a pathogen is spread?
1. Air 2. Water 3. Direct Contact
50
how do bacteria make us ill?
they produce toxins that damage our cells and tissues
51
how do viruses make us ill?
they invade a host cell and reproduce inside of it; continues to reproduce until the cell bursts, damaging that cell and releasing all the new viruses
52
how are viruses different to bacteria?
viruses need a host cell to reproduce in whereas bacteria can reproduce on their own
53
what causes cardiovascular disease? what type of people is cardiovascular disease increased an decreased in?
- a high in fat and low in vegetables diet increases certain types of cholesterol in the blood which increases the amount of fatty material in the arteries - increased in people who smoke - decreased in people who exercise
54
who is more likely to develop type 2 diabetes? (2)
- people with obesity - drinking excess alcohol can lead to obesity which, again, increases the risk of developing type 2 diabetes

Biology Paper 1 (5 decks)

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