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3 years ago

The difference in charge across the membrane is called the

Biology

1 answer:

Vikki [24]3 years ago

5 0

Answer:

The difference in charge across the membrane is called the membrane potential. It is measured in Milivolts.

At resting potential, the charge of the outside of the neuron is positive and the inside is negative. Once a stimulus changes the membrane potential, the neuron conducts an impulse called a(n) action potential.

This causes the charge outside the cell to temporarily become negative and the inside to temporarily become positive.

When the action potential arrives at the axon terminal it reaches a junction called the synaptic cleft.

Because the nerve impulse cannot cross the synaptic cleft, neurotransmitters are released.

Explanation:

The cell has a membrane that acts as a barrier between the outside and the inside of the cell, allowing the passage of some ions and retaining others. By doing this, there is a difference in charges between the inside and outside that is called the membrane potential, thanks to this difference in charge that the membrane creates the cell can communicate with other cells generating an action potential, which is a modification in the cell charge due to the flow of positive ions to the inside and the exit of negative ions to the outside. This is a temporary modification that ends when the action potential arrives at the presynaptic terminal releasing the neurotransmitters to the synaptic cleft, then the neurotransmitters will interact with the postsynaptic terminal receptors of a different neuron to open their ion channels and generate a new action potential.

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3 years ago

Identify which layer of the integumentary system each of the following is most likely to be found and provide a one phrase descr

Zielflug [23.3K]

Answer:

The integumentary system comprises the skin, nails, hair and exocrine glands. The average persons skin weighs a approximately 9Kilograms and spans about 20 square feet.

Phagocytic cells: These are found in the dermis or hypodermis. The skin layer that lies directly beneath the epidermis and above the subcutaneous layer is the dermis. It is made up of fibrous and flexible tissue and is the thickest layer of the skin. It thus gives the skin power and flexibility.

Phagocytic cells are cells within the skin that are designed for detecting, engulfing, and destroying pathogens (such as bacteria and other harmful organisms) and apoptotic cells. Apoptotic cells are cells in the human body that have spent their lifespan and are ready for replacement.

Keratinocytes: This is the most common type of cell in the human skin. It is mostly found on the Epidermis and comprises about 95% of the same.

The Epidermis is the most visible part of the skin. It is the part of the skin which the eyes can see. Its function is mostly protective. It receives all nutrition from the dermis because it does not contain any blood vessels.

Arrector Pili Muscle: Beneath the skin, there are tiny muscles that are attached to the base of a hair follicle at one end and to dermal tissue on the other end. These are known as the Arrector Pili.

Papillae: The dermal papillae comprise a little amount of the dermis. They project out of the epidermis. They aren't always immediately visible on the surface of the skin but tend to be quite obvious when examined under a microscope.

Melanocytes: These are neural crest-derived melanin-producing cells. They are mostly found in the lower layer of the skin's epidermis (also known as the stratum basale), the middle layer of the eye (uvea), the inner ear, the vaginal epithelium, the meninges, the bones, and the core. A black pigment mainly responsible for skin color is melanin.

Paccinian corpuscles: can always be seen in the deep part of the dermis of both glabrous and hairy skin. Structurally, they are very much like the Meissner's corpuscles.

Paccinian corpuscles can be found in the Periosteum of the bone, capsules of the joints, pancreas, other internal organs, breast, and genitalia.

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3 years ago

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Tasya [4]

Answer:

If predators increase then prey would decrease.

Explanation:

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3 years ago

Disscus the importance of phytoplankton to the composition of the earth's atmosphere?

Evgesh-ka [11]

Answer:

Phytoplankton are essential for atmospheric and climate regulation.

Explanation:

Phytoplankton are autotrophs, they use solar energy, along with inorganic carbon and water to produce their own food source via photosynthesis. During photosynthesis, they also produce oxygen, integral for the planet's atmospheric composition.

At their large biomass, phytoplankton contribute to a majority of the oxygen used by consumers (most animals).

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Along with fossil fuels, human agricultural practices have contributed large amounts of CO2 to the atmosphere, This causes global warming, a major environmental crisis- global warming also leads to landmass loss, biosphere disruption and reduces biodiversity in mass extinction events.

Phytoplankton carbon cycling produces organic matter which functions as carbon sinks in our oceans. Thus, as phytoplankton use large amounts of CO2, they help combat warming cycles, along with producing O2 in atmospheric and climate regulation.

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3 years ago