Answer:
Option A
Explanation:
The vestibular system is a part of the inner ear that provides the most important contribution to the sense of balance and coordinating movement with balance. This system is made up of two parts which are the three semicircular canals and the two otolith organs. The two otolith organs are the saccule and the utricle. The utricle is sensitive to changes with regards to horizontal movement and the saccule provides information about vertical acceleration. They are able to do this due to their orientation in the inner ear providing spatial orientation with regards to movement and balance. the three semi circular canals includes the horizontl, poterior and the superior semicircular canals. they provide sensory inputs.
This would be A, herbicides is a chemical used by humans not plants!
Slow-twitch fibers resist fatigue and keep contracted for long periods. Fast-twitch fibers provide force and fast contraction for short periods. Option C. timing of tension rise and fall.
<h3>
What is the difference between slow-twitch and fast-twitch motor units?</h3>
There are two muscle fiber types in the skeletal muscle, and their function is not the same. These are
<u>Slow-twitch muscle fibers</u> - Type I-
- These are small-sized fibers.
- They provide low force and slow contraction.
- These are fibers that resist fatigue and are in charge of sustained movements.
- They get to their maximum tension slower.
- Since their action is sustained for long periods, they need too much energy to keep working. This is why these cells have several mitochondria.
- They can support long periods of contraction.
<u>Fast-twitch muscle fibers</u> - Type II-
- They provide high force and fast contraction.
- They get to their maximum tension faster.
- These fibers offer a more powerful force than the slow-twitch ones.
- However, their duration is lower, and get to fatigue much faster. They offer short-period contractions.
- They support powerful and fast movements, but for short periods.
According to this information, we can assume that the main difference between slow-twitch and fast-twitch motor units is the timing of tension rise and fall. Option C.
You can learn more about slow-twitch and fast-twitch motor units at
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