electromyography

Question 1

Skeletal muscle is ensheathed in a tough connective tissue called the

Answer 1

epimysium

Question 2

what is a fascicle?

Answer 2

bundle of muscle fibers

Question 3

fascicles are ensheathed in a connective tissue ___________?

Answer 3

perimysium

Question 4

what does the perimysium do?

Answer 4

allows for passage for vasculature and
nerves

Question 5

each fascicle consists of many muscle fibers called _______

Answer 5

myocytes

Question 6

myocytes are ensheathed by a connective tissue ____________

Answer 6

endomysium

Question 7

what is a multinucleated syncytium?

Answer 7

fusion of multiple cells surrounded by a sarcolemma which contains sarcoplasm and many myofibrils

Question 8

what is the functional unit of contraction?

Answer 8

sarcomere

Question 9

Skeletal muscle fibers are considered striated because of the striped appearance of the sarcomeres under the microscope. This is due to the highly organized alternating pattern of __ bands and __ bands that are produced by long fibrous proteins called actin and myosin myofilaments.

Answer 9

A , I

Question 10

A motor neuron and all the muscle fibers it innervates is called a _______ _____.

Answer 10

motor unit

Question 11

what is multiple motor unit summation?

Answer 11

(recruitment) increasing the contractile
force of a muscle by increasing the number of motor units within a muscle

Question 12

what is temporal summation?

Answer 12

(=wave summation) increasing the contractile force of a muscle by increasing action potential frequency of individual motor units (i.e., stimulating a muscle cell before it has relaxed from a previous stimulus, thus increasing Ca2+ concentration levels and producing more
cross-bridges).

Question 13

what does an EMG do

Answer 13

examine the electrically activity of muscle during varying degrees of contraction