50 Questions
What is a sarcomere?
The basic contracting unit of skeletal muscle
What is a myofibril composed of?
Series of protein filaments
What is the function of a sarcomere?
To generate force
What is shared between adjacent sarcomeres?
Z discs
What is the arrangement of sarcomeres in a myofibril?
Laid end to end
What is the main function of actin filaments in a sarcomere?
To attach to Z lines and extend towards the centre of the sarcomere
What type of filaments appear to float in the middle of a sarcomere?
Thick myosin filaments
What is the name of the disc shared by adjacent sarcomeres?
Z line or Z disc
How are myosin filaments arranged in a sarcomere?
In between parallel actin fibres
What is the repeating unit of a myofibril?
Sarcomere
What is the name of the protein filament that can attach to Z lines in a sarcomere?
Actin
Where do myosin filaments primarily appear in a sarcomere?
Floating in the middle of the sarcomere
What is the function of myosin cross bridges in a sarcomere?
Walk the filaments past each other
What is the name of the disc that adjacent sarcomeres share?
Z line
What is the sliding filament theory used to explain in muscle contraction?
Cross bridge attachment and movement of filaments
What is the mechanism by which muscle fibres contract?
Myosin filaments slide past actin filaments
What is the role of little heads on myosin filaments?
To bind to actin filaments
What is the analogy used to explain muscle contraction?
Rowing a boat
What is the result of the interaction between myosin and actin filaments?
Muscle contraction
What is the term used to describe the sliding of filaments past each other?
Sliding filament theory
What happens when the little heads on myosin filaments bind to the adjacent filament?
The myosin filaments move past the actin filaments
What is the purpose of the sliding filament theory?
To explain how muscle fibres move past each other
What is the analogy used to explain the sliding filament theory?
Oars pushing water past a boat
What is the net result of the interaction between myosin and actin filaments?
Muscle contraction
What is the role of myosin filaments in the sliding filament theory?
They move past the actin filaments
What are the four main tissue types found in many different organ systems and structures?
Epithelial Tissue, Nervous Tissue, Muscle Tissue, Connective Tissue
What type of tissue is muscle tissue classified as?
Muscle Tissue
How many main tissue types are found in many different organ systems and structures?
Four
What is NOT one of the four main tissue types?
Blood Tissue
What do the four main tissue types include?
Epithelial, Connective, Muscle, and Nervous Tissue
What surrounds muscle fibers themselves?
Endomysium
What is the outer covering of the entire muscle?
Epimysium
What type of tissue surrounds muscle tissue?
Connective Tissue
What is the term for the bundles of muscle fibers?
Fascicles
What connects muscle to bone or other muscles?
Both A and B
What is the outermost layer that covers the entire muscle?
Epimysium
Which layer of connective tissue surrounds the bundles of muscle fibers called fascicles?
Perimysium
What type of tissue is continuous with the tendons or aponeuroses that connect muscle to bone or other muscles?
Connective Tissue
What is the middle layer of connective tissue that starts around muscle fibers themselves?
Endomysium
Which connective tissue layer surrounds muscle fibers directly?
Endomysium
What is the primary function of connective tissue in skeletal muscle?
To hold the muscle fibers together and to its surrounding structures
What can be found in the connective tissue layers surrounding skeletal muscle fibers?
Blood vessels, nerve fibers, and adipose tissue
What is the purpose of connective tissue in reducing friction in skeletal muscle?
To reduce friction caused by muscular forces
What is the role of adipose tissue in skeletal muscle connective tissue layers?
To store energy for muscle contraction
What do the connective tissue layers help skeletal muscle fibers do?
Move smoothly and efficiently with surrounding structures
Connective tissue in skeletal muscle fibers primarily serves to hold the components of the muscle together.
True
Adipose tissue is not present at all in the connective tissue layers surrounding skeletal muscles.
False
The connective tissue layers around skeletal muscle fibers do not contain blood vessels or nerve fibers.
False
Skeletal muscle fibers cannot exert a large force when they contract without being firmly fixed together.
True
The main function of connective tissue in skeletal muscles is to create friction between muscular forces.
False
Learn about sarcomeres, the basic contracting units of skeletal muscle which make up myofibrils. Discover how sarcomeres are connected and the role of Z lines in muscle contraction.
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