Exam 2 Review
The resting potential of a neuron is
-70mV
Lamellated corpuscles (Pacinian corpuscles) are
Tactile receptors
A person suffering from ________ can see distant objects more clearly than those that are close.
Hyperopia
Which muscle(s) would produce a twisting of the upper body?
external and internal oblique muscles
Damage to the hypothalamus can result in
fluctuations in body temp
After death, rigor mortis lasts until
myofilaments are broken down
Nearsightedness is more properly called
myopia
The myelin sheaths that surround the axons of some of the neurons in the CNS are formed by
oligodendrocytes
Receptors in the ________ provide sensations of gravity and linear acceleration.
one of these: internal acoustic meatus vestibule cochlea auditory ossicles
Which of the following extrinsic eye muscles is responsible for enabling the eye to roll, look up, and look laterally?
one of these: superior oblique medial rectus inferior oblique inferior rectus
Nociceptors are sensitive to
pain
Opening of voltage-gated sodium channels in the membrane of a neuron results in
depolarization
Sensory receptors that monitor the position of joints are called
proprioceptors
The perception of pain coming from parts of the body that are not actually stimulated is called
referred pain
The ossicles connect the
tympanic membrane to the oval window
Place these steps of muscle contraction in the correct order.1. Action potential is generated along the sarcolemma2. Nerve impulse arrives at synapse3. Calcium is released into muscle cell cytoplasm4. Acetylcholine is produced5. Actin and myosin molecules continuously cross-link, with actin molecules being pulled inward
2,4,1,3,5
Identify the correct sequence of steps in the generation of an action potential.1. Activation of sodium channels and rapid depolarization2. Inactivation of sodium channels and activation of potassium channels3. Depolarization to threshold4. Closing of potassium channels
3,1,2,4
The difference in the action when comparing the biceps brachii to the flexor carpi radialis, is
One of these -one muscle flexes the hand at the wrist and the other flexes the entire forearm. -one muscle flexes the arm and the other extends the arm. -one moves the ulna and the other moves the radius. -one of these muscles is voluntary while the other is involuntary.
Which of the following is an accurate characteristic of slow fibers?
Resting slow muscle fibers contain oxygen reserves, bound to myoglobin.
The glial cells responsible for maintaining the blood-brain barrier are the
astrocytes
The brain and spinal cord comprise the
central nervous system
Structural Components of a Skeletal Muscle Fiber
identify the parts
Calcium ions are released from the sarcoplasmic reticulum during the ________ phase of contraction.
latent
The fading of a dominant odor sometime after one enters a room is an example of experiencing
sensory adaptation
Looking at the muscle name sternocleidomastoid, you would identify that this muscle is located in the area of the
neck
Which structure secretes melatonin?
pineal gland
Which of the following is a function of the efferent division of the nervous system?
sending signals to muscles
Which of the following is a primary taste sensation?
sweet
Which muscle extends the elbow during the action of push-ups?
triceps brachii
The branch of the cranial nerve that is responsible for monitoring changes in equilibrium is the ________ branch.
vestibular
Which of the following is part of the inner layer of the wall of the eye?
retina
The photoreceptors of the retina are called
rods and cones
The heart has to be able to regulate its contractions. Heart muscle, unlike skeletal muscle, cannot go into a tetanus. This is because
the heart muscle has to be able to consistently contract and pump blood in a controlled fashion
Nonstriated, involuntary muscle is
smooth
Small phagocytic glial cells, which are derived from white blood cells, are called
microglia
The region of the brain that is involved in conscious thought and intellectual function as well as processing somatic sensory and motor information is the
cerebrum
The abducens nerve innervates which extrinsic eye muscle?
lateral rectus
The skeletal muscles store calcium ions in the terminal cisternae of the
sarcoplasmic reticulum
saltatory conduction
Rapid transmission of a nerve impulse along an axon, resulting from the action potential jumping from one node of Ranvier to another, skipping the myelin-sheathed regions of membrane.
The cranial nerve that has three branches is the
Trigeminal
Motor innervation of the muscles of facial expression is transmitted through which cranial nerve?
VII
Which neuroglial cells produce CSF in some regions of the brain?
ependymal
A layer of collagen fibers that surrounds an entire muscle is called
epimysium
The area between Z lines is the
sarcomere
The striated appearance of skeletal muscle results from
sarcoplasmic reticulum
