structure of skeletal muscle

Question 1

structure of skeletal muscle

Answer 1

muscle cells held together in bundles by connective tissue
allows the ability for adjacent bundles to glide over each other as they contract

Question 2

structure of skeletal muscle fibres

Answer 2

each muscle cell/fibre is an elongated cylinder with many nuclei
- around the cell is a thin plasma membrane: sarcolemma which contains cytoplasm that is called sarcoplasm

Question 3

what is a myrobfibril?

Answer 3

a thread-like structure found in the sarcoplasm

Question 4

structure of myofibril

Answer 4

each one composed of many smaller myofilaments, made of proteins which are involved in contraction of muscles

Question 5

two types of myofilaments , what they do?

Answer 5

thick myofilaments: myosin
thin myofilaments: actin
the thick and thin proteins slide past each other in a manner that shortens the myofibril

Question 6

sarcomeres

Answer 6

the contractile unit of skeletal muscle; consists of actin and myosin