all quizzes for exam 3
Which structure is known as AV valve with two flaps?
bicuspid valve
The middle trunk arises from which cervical nerve(s)?
c7
When is it that an impulse does not have to reach the brain?
in a reflex arc
Neurotransmitters are found in:
synaptic cleft
Which structure contains the utricle and saccule?
vestibule
Damage on which of the following cranial nerves would result in vertigo and unilateral hearing loss?
vetibulocochlear- CN VIII
Which of the following is NOT part of the conduction system of the heart?
AV valves
Gaps in the myelination of axons known as ______ are present ______.
Nodes of Ranvier; for saltatory conduction and increased speed of action potential transmission
During atrial systole,
The atrioventricular valves are open.
The "lubb" sound heard with a stethoscope is caused by:
Turbulence in the blood when the AV valves close
In the brain, the separation of the periosteal layer and the meningeal layer form which structure(s)?
all dural venous sinuses
Which structure prevents backflow into the left atrium?
biscupid valve
During the early phase of ventricular filling:
blood flows passively from atria to the ventricles
The superior trunk originates from the branches of which cervical nerve?
c5 and c6
In health humans, the cerebrospinal fluid (CSF) flows in a specific direction due to:
ependymal cells cilia
The femoral artery originates from the:
external iliac artery
The inferior trunk gives rise to which cords?
medial and posterior
The vital centers for the control of visceral activities such as heart rate, breathing, and blood pressure are located in the:
medulla oblongata
The larger the receptive field, the __________ it is to localize the stimulus.
more difficult
The lateral cord gives rise to which nerves?
musculocutaneous and median nerves
Potentially damaging stimuli that result in pain are selectively detected by:
nocireceptors
The receptors that get adapted over the course of time, and provide information on the intensity and rate of change of a stimulus are termed:
phasic receptors
A special feature of fenestrated capillaries is that they have:
pores
Olfactory glands function to:
secrete mucus
_________occurs when a receptor becomes so accustomed to the stimulation that it stops gathering impulses
sensory adaptation
Where in the spinal cord is the cerebrospinal fluid located?
subarachnoid space
The _________________________ innervates the superior oblique muscle.
trochlear nerve- CN IV
Which structure separates the external auditory canal form the middle ear?
tympanic membrane
The ___________________________nerve is the longest cranial nerve. It even goes down to the abdominal cavity and innervates the digestive system.
vagus nerve
The motor command leaves through the:
ventral root
The inferior mesenteric artery supplies blood to the:
Descending colon, sigmoid colon and rectum
Which of the following separates the primary motor cortex from the primary somatosensory cortex?
central sulcus
The sciatic nerve eventually branches into which nerves?
common fibular and tibia nerves
Which of the following is in the correct order of the olfactory pathway?
olfactory epithelium, olfactory nerve, olfactory tract, cerebral cortex
Which of the following glial cells is in charge of myelinating axons in the CNS?
oligodendrocytes
Small muscle masses attached to the chordae tendineae are the:
papillary muscles
The abducens nerve _________.
supplies innervation to the lateral rectus muscle of the eye
What is the largest mass of neuronal cell bodies found within the central nervous system?
thalamus
Veins need valves because:
Blood pressure is lowest in veins so the valves help it to oppose the force of gravity
Select the correct statement about the heart valves.
The AV valves are supported by chordae tendineae so that they do not blow back up into the atria during ventricular contraction
Which of the following statements is TRUE concerning blood circulation?
The right ventricle pumps deoxygenated blood to the lungs.
Ventricular systole happens:
Ventricular systole happens:
Lambert-Eaton myasthenic syndrome is an autoimmune disease that attacks voltage-gated calcium channels in the nerve terminal. Calcium channels are unable to open and as a result neurotransmitter is not released. What is a likely symptom of this condition?
inability to contract the muscles
Which of these types of receptors responds to pain stimuli?
nociceptors
Which of the following cranial nerves does innervate the eye?
oculomotor abducens trochlear
Below L1-L2, the vertebral canal is occupied by a bundle of spinal nerve roots called the:
cauda equina
Foramen ovale:
connects the two atria in the fetal heart
The spinal cord tapers at a conical tip called the:
conus medullaris
The area of the eye with the greatest visual acuity (sharpest vision) is the:
fovea centralis