Exam 3 Recall questions and homework quizzes

A muscle somewhat like a feather, with fibers obliquely approaching its tendon from both sides, is called a/an _______ muscle

bipennate

The cell body of a mature neuron lacks

centrioles

Saltatory conduction occurs only

myelinated axons

In the CNS, myelin is produced by glial cells called

oligodendrocytes

Which of the following muscles does not contribute to the rotator cuff?

teres major

Which of these is not a suprahyoid muscle?

genioglossus

Which of these muscles is an extensor of the neck?

splenius capitis

Which of these muscles of the pelvic floor is the deepest?

levator ani

Which of these actions is not performed by the trapezius?

abduction of the humerus

Both the hands and feet are acted upon by a muscle or muscles called

the abductor digti minimi

Which of the following muscles does not extend the hip joint?

quadriceps femoris

Both the gastrocnemius and _____ muscles insert on the heel by way of the calcaneal tendon.

soleus

A bundle of muscle fibers surrounded by perimysium is called a/an

fascicle

The three large muscles on the posterior side of the thigh are commonly known as the _______ muscles.

hamstring

The functional unit of a muscle fiber is the ______, a segment from one Z disc to the next.

sarcomere

Before a skeletal muscle fiber can contract, Ca2+ must bind to

troponin

Neurons that convey information to the CNS are called sensory, or ______, neurons.

afferent

Which of the following muscles raises the upper lip?

zygomaticus minor

What muscle is the prime mover in sucking through a soda straw or spitting out a mouthful of liquid?

buccinator

A muscle that works with another to produce the same or similar movement is called a/an

synergist

A circular muscle that closes a body opening is called a/an

sphincter

To make a muscle contract more strongly, the nervous system can activate more motor units. This process is called

recruitment

Before a skeletal muscle fiber can contract, ATP must bind to

the myosin head

smooth muscle cells have _____, whereas skeletal muscle fibers do not

calmodulin

ACh receptors are found mainly in

junction folds

The minimum stimulus intensity that will make a muscle contract is called

threshold

Parts of the sarcoplasmic reticulum called ________ lie on each side of a T tubule.

terminal cisters

Thick filaments consist mainly of the protein

myosin

Muscle contains an oxygen-binding pigment called

myoglobin

The integrative functions of the nervous system are performed mainly by

interneurons

The glial cells that fight infections in the CNS are

microglia

Some neurotransmitters can have either excitatory or inhibitory effects depending on the type of

receptors on the postsynaptic cell

Motor effects that depend on repetitive output from a neural pool are most likely to use

reverberating circuits

To perform their role, neurons must have the properties of excitability, secretion, and ______.

conductivity

The blank is a period of time in which a neuron is producing an action potential and cannot respond to another stimulus of any strength

absolute refractory period

Neurons receive incoming signals by way of specialized extensions of the cell called ______.

dendrites

A myelinated nerve fiber can produce action potentials only in specialized regions called

myelin sheath gaps

The neurotransmitter secreted at an adrenergic synapse is _______

norepinephrine

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