Flashcards in Muscles Deck (25):
Which type of muscle is non - striated and not under conscious control?
Where would you find smooth muscle?
Sheets in the walls of hollow organs and tubular substances to regulate diameter and propel substances forward through tracts
Which nervous system controls smooth muscle?
Autonomic nervous system
Which muscle is voluntary, under conscious control, part of the so,attic nervous system, striped and striated?
What are the property of muscle cells in skeletal muscle?
Several nuclei, many mitochondria, presence of myoglobin
What causes the skeletal muscle to contract and what happens when it does?
Stimulation from a nerves fibre - action potential spreads - conducted deep into the muscle cell rough a special network of channels that run through the sarcoplasm. Calcium released from intracellular stores. Calcium causes binding of myosin to actin filament forming cross - bridges, ATP provides energy for 2 filaments to slide over each other. Pulling z limes closer and shortening the sarcomere, if enough fibres are stimulated at the same time the whole muscle will shorten and contract.
What is the neuro transmitter involved in muscle contraction?
What constitutes a motor unit?
One nerve fibre and the muscle fibres it supplies
What does the strength of a contraction depend on?
Number of motor units in action at a particular time.
What type of motor unit would be used for larges Cale powerful movement?
One nerve serving many muscle cells
What kind of motor unit would be used for fine delicate movement?
One motor unit containing very few muscle fibres
What is the name of the connective tissue sheath covering the entire muscle?
What is the name of the connective tissue sheath covering the fascicles?
What is the name of the fine connective tissue layer covering the individual nerve cells?
What do tendons do?
Secure muscles to bone
What is the fleshy part of the muscle called?
What do ligaments do?
Bind bones together
What is the origin?
Point of attachment of a muscle to a bone that moves least during muscle contraction
Where the muscle joins the bone
Resists movement, opposes a muscle
Flex a muscle
Extend a muscle
Describe the tendon jerk reflex
Stimulate patella tendon - body of lower motor neurone stimulated - sends a reflex along sensory neurone - bypasses brain - goes to spinal cord - stimulates motor neurone causing thigh muscle to contract and knee kick forwards. Protective response