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. it is photosynthetic
Explanation:
A. it is photosynthetic - this is true - chlorophyll is a photosynthetic pigment that traps light energy to power food production. It present in green plants
B. it contains vascular tissues - this is false - eubacteria are single celled organisms that do not form tissues
C. it contains mitochondria - this is false - prokaryotic cells do not contain membrane-bound organelles like mitochondria
D. it is heterotrophic - this is false, plants and many bacteria are not heterotrophic, which means they consume other organisms for their food supply rather than creating their own (autotrophic)
Answer:
Type IIX fibers are characterized by high force/power/speed production and low endurance.
Explanation:
Self interest is the key principle that provides for the economic theory of supply and demand. Without self interest free market would struggle to regulate itself
<span>
In passive transport, molecules are moving from areas of high
concentration to areas of low concentration. Examples: diffusion,
osmosis (water). Protein channels and carriers are sometimes also
involved in passive transport. </span>
