2f Respiration

Question 1

What is respiration?

Answer 1

Respiration is a chemical reaction that uses food and energy that allows muscles to move

Question 2

Why does Breathing rate increase when we do excersice?

Answer 2

• Breathing takes in O2 and removes CO2
• O2 is needed for respiration (produces energy)
• The more exercise we do the more energy is required so we breathe faster to get more oxygen

Question 3

Why does Heart rate increase when we do excersice?

Answer 3

• Heart rate measures how fast your heart beats (You can measure rate by taking your pulse)
• The blood is pumped around the body and transports the glucose and oxygen to the cells for respiration to occur (in the mitochondria)
• During exercise more oxygen and glucose is needed as more energy is needed because the heart has to pump the blood around fasterk so it can get to the cells

Question 4

What is the equation for respiration?

Answer 4

glucose + oxygen -> water + CO2

Question 5

What is a test to show that carbon dioxide is a product in respiration?

Answer 5

Using limewater - turns from a clear colourless solution to a cloudy milky solution

Question 6

What is a test to show how much CO2 is present when you breathe out?

Answer 6

Hydrogen Carbonate indicator
It has a range of different colours that represent different concentrations of CO2
Yellow and Orange - High CO2
Pink - Atmospheric levels
Light purple and Purple - Low CO2

Question 7

What is the difference between breathing and respiration?

Answer 7

Breathing:
Can be controlled
A physical process
The process of taking in oxygen and expelling carbon dioxide
A process that takes place in the respiratory system
An exchange of gases between cells and the external environment
Involves two stages - ventilation and gas exchange

Respiration:
Cannot be controlled
Chemical process
Can be both a reaction which uses oxygen (aerobic) and does not use oxygen (anaerobic)
Takes place in the mitochondria inside cells
Energy is released from food substances, such as glucose in the presence of oxygen
Happens in all plants and animals and is vital to survival

Question 8

What is aerobic respiration?

Answer 8

When oxygen is used to gain energy from glucose

Question 9

What is anaerobic respiration?

Answer 9

It happens when your muscles work so hard that your lungs and circulatory system cannot deliver enough oxygen to break down all the available glucose through aerobic respiration.
Glucose -> lactic acid + energy

Question 10

How does lactic acid turn into aerobic respiration?

Answer 10

• The build up of lactic acid causes cramps and muscle fatigue
• After exercise we breathe more deeply (panting)
• When you breathe more deeply the lactic acid reacts with oxygen and it turns it into the other products of aerobic respiration
  Lactic acid + oxygen -> Carbon Dioxide + Water
• More oxygen is required which results in oxygen debt
• The lactic acid reacts with oxygen in the liver