MCQ: Respiration Flashcards
What is the 3-carbon molecule called?
Pyruvate
What is the first step in respiration?
Break-down of glucose, a six-carbon molecule to a three-carbon molecule.
Where does the break-down of six-carbon molecule to a three-carbon molecule take place?
Cytoplasm
In yeast what is pyruvate converted into?
Ethanol and carbon dioxide
Break down of pyruvate using oxygen takes place where?
Mitochondria
In the process using oxygen, break-down of three-carbon molecule to what?
To give 3 molecules of carbon dioxide. Also gives water.
During a lack of oxygen what happens?
Pyruvate converts into lactic acid a three carbon molecule, this causes cramps due to its build up in muscles.
Where is the ring of cartilage present?
Throat
What is the function of ring of cartilage?
To ensure that the air passage does not collapse.
What is the purpose of alveoli?
It provides a surface where the exchange of gases can take place.
When we breathe we lift our?
Ribs.
When we breathe we flatten our?
Diaphragm.
The lungs always contain?
Residual volume of air so there is sufficient time for oxygen to be absorbed and carbon dioxide to be realised.
What is the respiratory pigment in human beings?
Haemoglobin.
Where is Haemoglobin present?
Red blood corpuscles.
