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Btec Science, Biology, B3 Questions And Answers With Verified Solutions Already Passed!!!
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Btec Science, Biology, B3 Questions And Answers With Verified Solutions Already Passed!!!
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Btec Science, Biology, B3 QuestionsAnd Answers With Verified Solutions
Already Passed!!!
What are myofibrils? - ANSWER✔✔They are cylindrical organelles that run along
the length of muscle fibres, they are the site of muscle contraction
How are myosin and actin filaments arranged? - ANSWER✔✔In an alternating
pattern in sarcomeres, thick myosin filaments overlap with the thin actin filaments
at each end
What is a pair of muscles called? - ANSWER✔✔An antagonistic pair
What is the sarcolemma? - ANSWER✔✔The membrane of muscle fibres
what is the mitochandria? - ANSWER✔✔The organelle that provides lots of ATP
to power muscle contraction
What is skeletal muscle? - ANSWER✔✔It consists of bundles of muscle fibres.
Muscle fibres contain organelles that are the site of muscle contraction
What are the stages of the sliding filament theory? - ANSWER✔✔Depolarisation
of the sarcolemma
Contraction of sarcomeres
Muscle contraction
Muscle relaxation
, What is depolarisation? - ANSWER✔✔Refers to a sudden change in membrane
potential usually from a relatively negative to positive internal charge
When muscle fibres are at rest what is the protein that blocks the actin-myosin
binding site called? - ANSWER✔✔Tropomysin
Where is epithelial tissue found? - ANSWER✔✔Lining organs and surfaces
What are the different types of of epithelial tissue? - ANSWER✔✔Squamous
Columnar
Endothelium
What is squamous epithelium tissue made out of and what do these form? -
ANSWER✔✔It is made from flattened specialised squamous epithelial cells
form a thin, smooth, flat layer
What does a smooth, thin flat layer created by epithelium tissue allow? -
ANSWER✔✔Rapid difussion
What does smoking do to Epithelium cells? - ANSWER✔✔Smoking damages the
cells
it irritates and causes inflammation, and scarring in the epithelium tissue of the
lungs
What happens to the alveoli in the lungs when you smoke? - ANSWER✔✔The
alveoli walls become thicker due to scarring and produce more mucous, this
damage to the air sacs causes emphysema and the lungs lose their natural elasticity
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