Cells & Tissues (Muscle) Flashcards
3 words for muscle cells?
Cells, Fibres, monocytes.
How do Fibres join in cardiac tissue?
End-end through intercalated discs which contain desmosome (contractions) and gap junctions (communication).
What are the Fibres in cardiac tissue and describe them?
Purkinje Fibres. Conduct electricity. Heart. Less myofribrils. More connexins.
Name the 5 types of connective tissue in skeletal muscle tissue.
Sarcolemma, sarcoplasm, perimysium, epimysium, endomysium.
What does the endomysium surround?
Muscle cells. Layer for capillaries / nerves.
What does the perimysium surround?
Vesticles
What is the name of the longest skeletal muscle and where is it found? What is it’s function?
Sartorius.
Hip: Flexor, abductor, lateral rotator.
Knee: Flexor.
Motion, posture, heat, protection.
What is the smallest skeletal muscle? Location and function?
Stabilizes stapes I’m sad by tightening to prevent hyperacusis, tympatic reflex, Bell’s palsy.
Where specially are myofibrils found?
In skeletal muscle tissue, fill the sarcoplasm and extend its length.
How are myofibrils arranged?
In compartments called sarcomeres. Z discs separate sarcomeres.
What myofilaments are in the myofibrils?
Thin: mostly actin.
Thick: myosin.
Name the 6 parts of strations and what happens when the muscle contracts.
A band, I band, H zone, M line, Z disc, Titin. The I and H band are lost during contraction.
A band
Dark, middle, thick filaments.
M line
Middle of sarcomere, holds thick filaments together.
Z disc
Passes through centre of I band (between sarcomeres). Made up of actinins that link filaments of adjacent sarcomeres.
