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