Attempting to pick up an object too heavy to lift would result in which type of muscle contraction?
Isotonic
Flaccid
Treppe
Isometric
The Correct Answer is D
A. Isotonic: In an isotonic contraction, the muscle changes length to move a load. If the object is too heavy to lift, no movement occurs.
B. Flaccid: Flaccid refers to a lack of muscle tone (limpness), which is not the state of a muscle trying to lift a heavy weight.
C. Treppe: Treppe (the "staircase effect") refers to an increase in the force of contraction when a muscle is stimulated repeatedly after relaxation.
D. Isometric: An isometric contraction occurs when tension increases in the muscle, but the muscle does not shorten because the load is too great to move.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Viruses: Viruses are the simplest pathogens, consisting only of genetic material and a protein coat.
B. Tapeworms: These are the most complex because they are multicellular animals (helminths) with specialized organ systems for reproduction and attachment.
C. Bacteria: These are single-celled prokaryotic organisms, which are more complex than viruses but less complex than multicellular animals.
D. Protozoa: These are single-celled eukaryotic organisms; while complex for a single cell, they lack the tissue and organ complexity of a worm.
Correct Answer is B
Explanation
A. central canal: This is the space in the center of the spinal cord through which CSF flows, but it is not the primary site of formation.
B. choroid plexuses: These are networks of capillaries found in the ventricles of the brain specifically designed to filter blood and produce CSF.
C. subarachnoid space: This is the area where CSF circulates around the brain and spinal cord.
D. arachnoid villi: These are responsible for the reabsorption of CSF back into the blood, not its formation.
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