Confused on what has to be answered but that’s the spirit
An insulating plate, such as plastic, tends to be positively charged when rubbed with cloth due to the piezoelectric effect. This phenomenon involves certain materials to generate charged particles as a response to mechanical stress applied to it. In this case, the mechanical stress was due to the rubbing motion.
Answer: mRNA moves through pores in the nuclear membrane
Explanation: nuclear membrane pores permit the passage of mRNA, but only after processing within the nucleus. The non-coding parts of the RNA are deleted (introns), the 5’ end capped to prevent premature degradation, and a string of A nucleotides added at the 3’ end (improves stability).
Answer:
When a doctor strikes the child's kneecap:
- <em>The </em><em>sensory receptors </em><em>located in the tendon receive the stimulus.</em>
- <em>Information travels by </em><em>afferent pathway </em><em>through the sensory component of </em><em>motor nerve</em>
- <em>The integration center, in the </em><em>spinal cord</em><em>, receives the information and sends a motor response by </em><em>efferent pathway</em><em>.</em>
- <em>The </em><em>quadriceps contracts and extends the leg</em><em>.</em>
Explanation:
The patellar reflex —by hitting the kneecap tendon—is an example of a reflex arc, which produces the extension of the leg over the knee as an involuntary response to the stimulus to strike the patellar tendon.
This reflex has five main components:
- <em>Receptor.</em>
- <em>Sensitive fibers of a motor nerve (afferent pathway)</em>
- <em>Spinal cord integration center.</em>
- <em>Motor nerve fibers (efferent pathway).</em>
- <em>Effector.</em>
The reflex arc occurs because the stimulus received does not travel to the brain, but to the spinal cord, which causes the reflex response to be faster.
When the doctor strikes sensory neurons below the boy's kneecap, the following sequence of events occurs:
- The sensory receptors located in the tendon receive the stimulus.
- Information travels by afferent pathway through the sensory component of the femoral nerve.
- The integration center, in the spinal cord, receives theinformation and sends a motor response by efferent pathway.
- The quadriceps contracts and extends the leg.
The patellar reflex evaluates the integrality of the reflex arc at that level, whose synapse occurs between the lumbar segments of the spinal nerve L₂ and L₄.
An alimentary canal is a digestive tract that is complete and has two openings which are the mouth and the anus. On the other hand a gastrovascular is a digestive tract that has only one opening. The advantage of the alimentary canal is the fact that intake of food can still go on even during digestion. This will enable a more complete digestion.