Flashcards in MUSCULAR SYSTEM PT 1 (UNFINISHED) Deck (58)
Define Electrical Excitability of muscle tissue.
Muscle tissue responds to stimuli by PRODUCING APs
Define Contractility of muscle tissue.
GENERATE TENSION when stimulated by an AP
Define Extensibility of muscle tissue.
STRETCH (LENGTHEN) WTHOUT DAMAGE
Define Elasticity of muscle tissue.
RETURN ORIGINAL SHAPE after contraction or stretch
List the order of the Hierarchy of Skeletal Organization.
Muscle Fibre (Muscle Cell)
What are the characteristics fro Skeletal/Striated Muscle?
- Alternating light and dark bands
- Voluntary/conscious control
A Muscle is subdivided into?
Bundles of fascicles
Describe a Fascicle.
Measured in MM. Made up of many muscle fibres
Describe a Muscle Fibre/Muscle Cell.
Cylindrical in shape and filled with Myofibrils
What is 'Sarcolemma'?
PLASMA MEMBRANE of muscle cell
What are Transverse Tubules (T-tubules)?
Tiny TUNNELS in from the sarcolemma towards the centre of muscle fibre.
What is 'Sarcoplasm'?
The cytoplasm of the muscle fibres, containing glycogen
Describe a Myoglobin.
A protein binding oxygen that diffuses into muscle fibres and delivers it to the mitochondria.
What are Myofibrils?
CONTRACTILE ORGANELLES of the muscle cell
What is the function of Cytoskeletal Proteins in Myofibrils?
Holds Myofibrils in place
What is Sarcoplasmic Reticulum?
SACS/TUBES surrounding each myofibril storing and releasing CALCIUM into cell
Define a Sarcomere.
Functional units of a myofibril (contractions)
What is an Actin?
Makes up THIN filaments
What is an Myosin?
Makes up THICK filaments
What generates force/contractions of a Myofibril?
The overlap and interaction of thick and thin filaments
What are Myofilaments?
2 contractile proteins of the Sarcomere: Actin and Myosin
Explain the PROCESS of the Neurological Control of muscle tissue.
1. Axons reaches muscle using Axon Terminals
2. Axon Terminals form junction with Sarcolemma
3. Axons release Acetylcholine (ACh) over the synaptic cleft
What is a Motor Neuron?
A nerve cell that conducts APs to muscle cells
What is a Motor Unit?
The motor neuron and all the skeletal muscle fibres it innervates
Precise movements require _______ changes in muscle contraction
Imprecise movements require _______ amounts of tension.
Muscles that perform ______ movements are made up of small motor units.
Muscles that perform _______ movements are made up of large motor units.
Explain Motor Unit Recruitment.
AP travels down motor neuron to muscle fibres which will generate force in that motor unit