What is the best description of how a given muscle fiber can be inhibited from contracting?
A. Inhibitory inputs from local reflexes and descending pathways prevent the fiber's motor neuron from firing action potentials.
B. Descending inputs from brainstem components of the middle level of the motor control hierarchy make inhibitory synapses onto the muscle fibers.
C. Contractions in an antagonistic muscle's fibers are stronger than the given muscle's contractions.
D. Golgi tendon organs send afferent neurons directly to muscle fibers that attach to them and release inhibitory neurotransmitter.
E. Interneurons in the local spinal cord region send axons to the muscle fiber's neuromuscular junction, where they impose presynaptic inhibition.
A
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A premature baby born at 27 weeks gestation is suffering from respiratory distress syndrome. What is the probable cause?
A. The foramen ovale failed to close at birth. B. Fluid in the lungs was not adequately reabsorbed by the blood and lymphatic capillaries. C. The alveoli are not adequately developed by 27 weeks. D. The breath was not vigorous enough to pop open the alveoli. E. There is not enough surfactant to keep the alveoli from collapsing.
The patellar ligament connects the medial condyle of the femur to the medial condyle of
the tibia. Indicate whether the statement is true or false
Synaptic plasticity involves structural changes in neurons, such as ________.
A. formation of dendritic spines B. formation of axillary branches C. formation of more axon terminals D. mitosis of neurons
This is the toughest kind of cartilage. It is found in places that receive a lot of mechanical stress
A) fibrocartilage B) hyaline cartilage C) elastic cartilage