Answer:
A Muscle Contraction Is Triggered When an Action Potential Travels Along the Nerves to the Muscles.Muscle contraction begins when the nervous system generates a signal. The signal, an impulse called an action potential, travels through a type of nerve cell called a motor neuron. The neuromuscular junction is the name of the place where the motor neuron reaches a muscle cell. Skeletal muscle tissue is composed of cells called muscle fibers. When the nervous system signal reaches the neuromuscular junction a chemical message is released by the motor neuron. The chemical message, a neurotransmitter called acetylcholine, binds to receptors on the outside of the muscle fiber. That starts a chemical reaction within the muscle.Acetylcholine Is Released and Binds to Receptors on the Muscle Membrane.
A multistep molecular process within the muscle fiber begins when acetylcholine binds to receptors on the muscle fiber membrane. The proteins inside muscle fibers are organized into long chains that can interact with each other, reorganizing to shorten and relax. When acetylcholine reaches receptors on the membranes of muscle fibers, membrane channels open and the process that contracts a relaxed muscle fibers begins:
Open channels allow an influx of sodium ions into the cytoplasm of the muscle fiber.
The sodium influx also sends a message within the muscle fiber to trigger the release of stored calcium ions.
The calcium ions diffuse into the muscle fiber.
The relationship between the chains of proteins within the muscle cells changes, leading to the contraction.
Explanation:
Sry I don’t know how to explain It’s a lot.
Answer:
A is the correct answer
Explanation:
a process brought about due to volcanic upheaval; the undersea equivalents of terrestrial mountains that rise from the sea bottom and do not break the surface of the water
Answer:
In ecosystems, matter and energy are transferred from one form to another. ... Nutrients and living matter are passed from producers to consumers, then broken down by decomposers.
Explanation:
The nurse recognizes the term “word salad” as describing this type of communication
Word salad is a combination of seemingly random words or phrases to form incomprehensible statements that is unclear and difficult to understand. Word salad is usually used to describe a symptom of a neurological or mental disorder (such as schizophrenia and dementia) in people. The affected persons do not usually know that they do not make sense when using word salad to communicate.
Answer:
His cell observations have no indication of the nucleus and other organelles found in most living cells, he made use of a microscope containing improved lenses.
Explanation:
None
