1. During intense exer- Low pH changes the shape of the calcium ion recep-
cise the ph of skele- tors; [1 mark]
tal muscle tissue falls (This means that) fewer calcium ions will bind to
sharply . The de- troponin; [1 mark]
crease in ph reduces (So) fewer tropomyosin molecules move (away) /
the ability of calci- change shape; [1 mark]
um ions to stimulate This causes fewer binding sites on actin to be re-
muscle contraction vealed; [1 mark]
(So) fewer cross-bridges can form / fewer myosin
heads can bind (to actin)
2. What are similarities - they both produce energy and help in movement
between slow twitch -they both generate a force by contraction
and fast twitch mus- -they are both present in relatively equal amounts in
cle fibres ? the body
3. What are the differ- fast twitch fibres are thicker whereas slow twitch fi-
ences between slow bres are thinner/narrower
twitch and fast twitch Appearance: fast twitch fibre tends to be a different
muscle fibres ? colour/lighter whereas slow twitch tissue is darker
Contraction: Slow twitch have slow contractions for
a long period of time whereas fast twitch have fast
contractions for a short period of time
4. Explain how muscles using antagonistic muscle
maintain posture ? both contract to keep joint upwright
only a few fibres contract to avoid fatigue
5. Explain why anaer- Lactate is produced during anaerobic respiration
obic respiration can it creates oxygen debt within the muscle cells
only be done for short only a small amount of ATP is produced during anaer-
periods of time in the obic respiration
muscle ?.
6. Explain what hap- There heart rate would increase
pens to the heart since a small volume of blood is pumped per beat the
rate of a person if heart would have to pump faster to maintain cardiac
there stroke volume output
decreases ?
1/3
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller CodedNurse. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $22.99. You're not tied to anything after your purchase.
