Answer:
B
Explanation:
that seems to be the best one
An action potential in a muscle cell is initiated by acetylcholine, which binds to receptors on the muscle cell membrane, causing depolarization. This triggers voltage-gated sodium channels to open, allowing sodium influx into the cell, which propagates the action potential. The action potential then leads to muscle contraction.
An action potential on a muscle cell is initiated through a complex sequence of events. First, a neurotransmitter called acetylcholine (ACh) is released from the motor neuron and binds to receptors on the muscle cell membrane or sarcolemma. This binding opens up a channel in the ACh receptor, allowing positively charged sodium ions to enter the muscle fiber.
This ion movement causes the muscle fiber to depolarize, or become less negative, changing the membrane potential. As the membrane depolarizes, another set of ion channels, the voltage-gated sodium channels, are activated and trigger an influx of more sodium ions into the muscle fiber.
This flooding of sodium ions propagates an action potential, or electrical signal, across the entire muscle cell membrane. This action potential then interacts with the sarcoplasmic reticulum to release calcium ions, leading to muscle contraction.
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Answer: Move substances
Explanation:
The process of diffusion and active transport are some of the process inside the body which helps in transportation of the materials from one place to another.
The substances move a region of higher concentration to lower concentration in case of diffusion and with the help of energy the molecules moves from lower concentration to higher concentration.
The correct answer is option D.
The right option is; B. Woody dicot stem
Woody dicot stem is a type of dicot stem that is made up of a cork, epidermis, cork cambium, xylem, phloem, cortex, vascular cambium, and pith. When woody dicots becomes mature, the vascular bundles connect together to form continuous rings along the interior of the stem. During winter in each year when there is reduced growth in plants that have woody dicot stems, there is production of annual rings which can be counted to determine the age of the plant.
Archaea and Eukarya.
On the basis of the information provided in the question, the ultimate branch of the phylogenetic tree starts with the line of Eukarya and then possesses the species of the Archaea division that comprises those prokaryotic species, which thrives in extremely tough environmental scenarios.
As the last branch possesses species of two domains, that is, Eukarya and Archaea and it starts with Eukarya and afterward holds the species of Archaea, which shows that both Eukarya and Archaea are associated genetically.