<span>Melanin helps protect the skin against effects of the sun such as skin cancers and premature aging. In African American skin, melanin provides a sun protection factor (SPF) equivalent to 13.4 compared to 3.4 in white skin and thus the former have lower incidences of skin disorders associated with exposure to the sun.</span>
Answer:
Action potential in a motor neuron triggers the release of acetylcholine (ACh) neurotransmitter.
Explanation:
Acetylcholine: It is a neurotransmitter released by motor neurons which bind to the receptors end plates of the motor. When an action potential travel down the motor neuron's axon, neurotransmitter release occurs resulting in an influx of calcium and altered permeability of the synaptic terminal membrane.
The Ca2+ ions allow synaptic vesicles to move and bind with the presynaptic membrane which is present on the neuron and released neurotransmitter from the vesicles into the synaptic cleft. Once it's released ACh diffusion occurs across the synaptic cleft to the motor end plate, and binds with ACh receptor. As the neurotransmitter ACh binds, these ions channel open and sodium ions cross the membrane into the muscle cells.
In this phase reduction of voltage inside and outside the cell occurs, which is known as depolarization. When ACh binds to the motor end plate this depolarization is known as end plate potential. Then depolarization spread with the sarcolemma and creating an action potential. This action potential moves the entire cell and creating a wave of depolarization.
Spores and seeds have basically the same function-dispersal-but are vastly different because spores (D) are unicellular; seeds are not.
<h3>What are unicellular organism?</h3>
A unicellular organism can be regarded as single-celled organism, which are those organisms that consists of a single cell.
This is different from multicellular organism because it consists of multiple cells however Organisms can be selected base on general categories which are prokaryotic organisms and eukaryotic organisms.
It should be noted that Spores and seeds have basically the same function-dispersal-but are vastly different because spores (D) are unicellular; seeds are not.
Therefore option D is correct.
Read more about Spores here:
brainly.com/question/3529377
#SPJ1
Answer:
to contract a muscle, myosin and actin filaments shorten, requiring ATP binding and hydrolysis
Explanation:
hopes it help
