Muscle mimic test
Rhomboid muscles squeeze your clavicles together. What is the antagonist muscle that pulls them apart?
Pectoralis Major
Describe Cardiac muscle and how it is similar/different from skeletal
makes up heart, involuntary, single nucleus, intercalated
What makes up a motor unit?
muscle fiber + motor neuron
A toxin blocks the acetylchoine receptors on muscle tissue. this would result in
Inability of the muscles to respond to motor nerve stimulus
What would a lack of acetylcholinesterase in the synaptic cleft result in?
excessive, continuos stimulation of the muscle fiber
Long distance exercises such as running and swimming have this effect on skeletal muscle tissue
fatigue increased amount of myoglobin in the muscles
Name some actions caused by skeletal muscles
lifting objects, moving fingers + toes, running/walking
What is the function of ACH (acetylcholine)
Triggers AP (action potential)
The two major regulatory proteins found in muscle called?
Troponin + tropomyosin
Events of muscle contraction
1. Nerve impulse arrives at axon terminal + trigger release of ACH 2. ACH diffuses across cleft triggers AP/ same time acetylcholineterase stops excess ACH 3. AP cause Ca+ relase in SR--> unto sarcoplasm binds to troponin exposing bonding site for myosin head 4. Myosin head attaches forms cross bridge to actin 5. Power Strokes/ Recovery Strokes 6. Tropomyosin blocks myosin binding site.
What is fibromyalgia
A muscular disorder characterized by painful musculoskeletal "tender points"
Describes what happens when an action potential reaches the presynaptic terminal of the motor neuron.
ACH is released into the synaptic cleft
What is the name of the flat tendons found in various locations in the muscle system?
Aponehrosis
What happens to energy that isn't transferred into movement?
Becomes heat
The semitendinosus is one hamstring muscle. Which muscle below is another?
Biceps femoris
Each muscle fiber is surrounded by a connective tissue called?
Epimysium
What is Muscular dystrophy?
Skeletal muscle degeneration
what kind of muscle would make up: bicep, stomach, heart
bi: skeletal, sto: smooth, heart: cardiac
What are the effects of anabolic steroids?
builds muscle protein increases muscle strength can cause various health issues
How does the bicep brachii muscle respond differently between the activity of lifting a pencil + holding a book
more muscle units for a book than a pencil
what is fascicle and how is it related to a myofibril and myofilament?
muscle-->fasicles-->myofibrils-->myofilaments (actin + myosin)
Which term is the smallest subdivision in this group?
myofilament
What is the smallest contractile unit of muscle called?
sacromere
What is rigor mortis?
stiffening of body when someone dies. Excessive calcium release in muscles.
Describe skeletal muscle appearance and fucntion
striated, voluntary, multinucleate
When a nervous impulse travels from a neuron to a muscle cell, what happens next?
the impulse travels out the sacrolemma
what muscle enables you to elevate your scapula
trapezius
Muscle fiber contraction is all or none
true
