Examl 3:l BIOl 201/l BIO201l (Latestl 2025/l
2026l Update)l Humanl Anatomyl andl Physiologyl Il Review|l Questionsl &l Answers|l Gradel A|l 100%l Correctl (Verifiedl Solutions)-l GCU
Q:l Whatl isl beneathl thel sarcolemma?
Answer:
Nuclei
Q:l Whatl arel myofibrils?
Answer:
Bundlesl ofl myofilaments
Q:l Whatl arel thel distinctl bandsl ofl al myofibril?
Answer:
Il bandl andl Al band
Q:l Whatl isl thel contractilel unitl ofl al musclel fiber?
Answer:
sarcomere
Q:l Whatl makesl upl al sarcomere?
Answer:
Thickl filamentsl andl thinl filaments
- / 3
Q:l Whatl arel thickl filaments?
Answer:
Myosin
Q:l Whatl arel thinl filaments?
Answer:
Actin
Q:l Whatl isl thel Hl zone?
Answer:
Barel zone,l wherel itl lacksl actinl filamentsl (dol notl overlap)
Q:l Whatl isl alsol inl thel Hl zone?
Answer:
Ml line
Q:l Whatl separatesl al sarcomere?
Answer:
Zl discs
Q:l Whatl dol thickl filamentsl produce?
Answer:
Darkl Al band
Q:l Wherel dol thinl filamentsl extendl inl eachl direction?
Answer: 2 / 3
Zl disc
Q:l Whatl doesl thel filamentsl NOTl overlappingl create?
Answer:
lightl Il band
Q:l Whatl isl myosinl shapedl like?l Withl 2l what?
Answer:
Shapedl likel al golfl clubl withl 2l heads
Q:l Whatl proteinsl dol thinl filamentsl interactl with?
Answer:
Tropomyosinl andl troponin
Q:l Whatl isl thel slidingl filamentl theory?
Answer:
Sarcomerel contractsl causingl thel myofibrill tol shorten
Q:l Dol filamentsl changel lengthl whenl al musclel contracts?
Answer:
No
Q:l Whenl actinl filamentsl slidel betweenl myosinl filamentsl isl thel zonel ofl overlapl largerl orl smaller?
Answer:
Larger
- / 3