Injury to lower motor neurons results in: - flaccid paralysis
The hypothalamus: - is connected to the pituitary via the infundibulum
There is a semilunar valve between the: - right ventricle and pulmonary trunk
The role of the papillary muscles is to: - tighten the chordae tendineae by con...
Medsci 142 Exam 2024,2025
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Injury to lower motor neurons results in: - flaccid paralysis
The hypothalamus: - is connected to the pituitary via the infundibulum
There is a semilunar valve between the: - right ventricle and pulmonary trunk
The role of the papillary muscles is to: - tighten the chordae tendineae by contracting during ventricular
systole
Which of the following occurs when the aortic and mitral valves are both closed? - pressure in the left
ventricle is either rapidly increasing or rapidly decreasing
The fibers responsible for conveying discriminative touch and pressure sensations from the skin to the
spinal cord: - are heavily myelinated fibers
When a steroid hormone binds to its target cell receptor, it: - turns specific genes of the nuclear DNA on
or off.
During the normal cardiac cycle, the atria contract when they are initially stimulated by the: - SA node
"Economy class syndrome" is a popular term used to describe deep vein thrombosis when it occurs in air
travelers on long-haul flights. In deep vein thrombosis, a large cylindrical blood clot forms in a vein of
the leg. If the clot breaks free and begins to move with the blood flow, it is likely to lodge in the: -
pulmonary artery.
,The fibres responsible for conveying pain and temperature sensations from the skin to the spinal cord
are: - unmyelinated fibers
After a satisfying lunch, you are likely to experience the results of: - Upregulated parasympathetic
system activation
Releasing and inhibiting hormones are produced by the: - hypothalamus to control the anterior pituitary
Which organ is NOT associated with the digestive system?
- Jejunum
- Pancreas
- Spleen
- Liver
- Hepatic Portal Vein - Spleen
A middle-aged, overweight man suffers a heart attack (myocardial infarction). About a week later the
wall of his left ventricle, weakened by the presence of an area of dead muscle, ruptures. Blood from the
left ventricle exits through the rupture and enters the pericardial space. As pressure rises in the
pericardial space, it compresses the ventricles and begins to affect the filling of the ventricles during
diastole. If atrial pressure remains the same, which of these is the lowest (pericardial) pressure when
there will be no ventricular filling? - 10mmHg
A coronal section that cuts through letters Q, E and C is likely to contain all of the following structures
EXCEPT: - Substantia Nigra
Which neurotransmitter is used at the synapse by both motor neurons and pre-ganglionic autonomic
neurons? - Acetylcholine
Identify the organ that is NOT associated with the peritoneum in the Rat.
- Bladder
- Mesentery Tissue
- Gall Bladder
,- Kidney
- Pancreas - Gall Bladder
Blood flows into the coronary arteries from the: - ascending aorta
The function of the chordae tendineae is to: - prevent eversion of the AV valves during ventricular
systole
Paired masses of gray matter within the white matter of the cerebrum that are rich in dopamine and are
involved in maintenance of muscle tone are the: - basal ganglia
The compound that most often acts as a second messenger is: - cAMP
Which of the following happens most rapidly in our bodies when we are in a situation of immediate
danger or alarm? - Sympathetic nerve signals affect various body functions.
When you started your rat dissection, the first serous membrane which you cut with scissors was the: -
parietal peritoneum
Which of the following statements is correct about the left ventricle?
- pumps blood into the pulmonary trunk
- has an atrioventricular valve with 3 cusps
- contains oxygenated blood
- has a 'C' shaped lumen when cut in cross-section
List the elements of the heart's conduction system in the correct order - SA node, AV node, AV bundle,
bundle branches, conduction myofibers
Which of the following lists contains ONLY forebrain structures?
, - Cerebellum, Medulla, Pons
- Corpus Callosum, Thalamus, Hypothalamus
- Later Ventricles, Third Ventricle, Cerebral Aqueduct
- Thalamus, Cerebral Hemispheres, Medulla - Corpus Callosum, Thalamus, Hypothalamus
The duodenum receives material from which three organs? - stomach, liver & pancreas
Blood flows from the superior vena cava into the: - right atrium
The SA node is located: - in the right atrial wall near the opening of the superior vena cava
Which of the following statements about the anatomy of the human heart is INCORRECT?
- The apex of the heart is comprised mainly of the right ventricle
- The ventricular inlets are larger than the outlets
- The right ventricle is crescent-shaped in cross-section
- The aortic valve is posterior to the pulmonary valve
- The atria and great veins are more posterior than the ventricles and great arteries - The apex of the
heart is comprised mainly of the right ventricle
During the cardiac cycle, the volume of blood in the ventricles: - decreases most rapidly early in the
phase of ventricular ejection
Cardiac output refers to the - volume of blood ejected from the left ventricle per minute
The diameter of blood vessels most directly affects: - resistance
Stimulation of the heart by autonomic nerve fibers traveling with the vagus nerve causes: - decreased
heart rate and no change in ventricular contractility
All of the following are treatments for Parkinson's disease EXCEPT:
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