respiration- exam qs

Question 1

black bears can hibernate up to 7 months without food or water. Suggest and explain how

Answer 1

fat stored used in respiration
less energy required due to low metabolism
gluconeogenesis
low SA:V reduce heat loss

Question 2

during hibernation HR and metabolic rate decreases. describe how these are linked- nervous control of HR

Answer 2

less co2 in blood- increase pH
detected by chemoreceptors located in aorta/carotid artery
fewer impulses to medulla oblongata
more impulse along parasympathetic neurone/less impulse along sympathetic neurone
to SAN

Question 3

expalin how this could ensure survival of species population

Answer 3

species with…. more likely to survive
they can reproduce
pass on advantageous allele
frequency of allele increase in future population

Question 4

prep of isolated mitochondra and suitable substrate (pyruvate) why did the scientist not use glucose?

Answer 4

glucose is broken down during glycolysis on cytoplasm not mitochondria
glucose cannot cross mitochondrial membrane

Question 5

why is the tap and syringe removed for 10mins

Answer 5

eq. reached
allow pressure changes in apparatus
allow respiration rate of seeds to stabilise