Tapping on the patellar tendon stretches receptors called the muscle spindles in the quadriceps muscle group of the anterior thigh. This stimulus evokes a rapid motor reflex to contract the quadriceps and shorten the muscles. This process is <span>called the patellar reflex.</span>
Stretch reflex causes muscle fiber to stretch. This situation sends sensory signals to the spinal cord and the response is a muscle contraction, in this case, the femoral quadriceps contraction.
Explanation:
The stretch reflex occurs at the muscle level and for it to occur it is important to emphasize a structure wrapped deep in the muscle fibers of the central region of the muscle. This structure is called muscle spindle or neuromuscular spindle and is very sensitive to stretching (stretching) of muscle fibers.
When muscle fiber stretching occurs, the spindle sends sensory signals to the spinal cord and the response is a contraction of the same muscle to prevent its fibers from rupturing, generating a protective response. This is how the stretch reflex causes the femoral quadriceps muscle group to contract.
I predict that the amount of agar solution dyed blue will be about 50 units. This is because if you calculate the ratios of the agar to the urea amount, it's always about .6666 repeating. SO if you plug that number in and figure it out algebraically, it is about 50.
Environment can affect the phenotype. for example person A has tall phenotype in his gene but because of he don't eat a good diet like lack of protein or calcium or don't make too much exercise so it affected their phenotype.
