The membrane potential of a nerve cell will depolarize (become less negative) if there is an INCREASE in the __.

Biology

1 answer:

slava [35]3 years ago

6 0

Answer:

The membrane potential of a nerve cell will depolarize if there is an increase in the positive ions inside the cell.

Explanation:

When nerves are in resting potential it is -70mV. In this stage interior of the cell is negatively charged and outside is more positive. When depolarization occurs the inside cell becomes positive.

This is due to the rush of sodium ions into the cell by voltage-gated channels. Now the inside charge is more positive and the chloride ions move out of the cell. Thus outside becomes more negative.

After some time of depolarization stage, potassium ions move out of the cell making the nerve cell again negative. Now the depolarized stage becomes repolarized by the entry of potassium ions.

During depolarization, the potential of the cell is -55mV. When repolarization occurs, it is again -70mV. But the potassium channels are open and some of the potassium ions move out of the cell making the inside environment more negative. This is known as hyperpolarization condition.

This hyperpolarization remains for a short period where action potential can't occur. This period is called the refractory period. Again potassium ions enter into the cell. This results in the resting potential of the neuron again.

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Can you match these prefixes, suffixes, and word roots with their definitions? a. omni- first: eat: few: under, below: from, out

natima [27]

Answer:

The correct matches are:

all: omni-
first: prim-
eat: -vor
few: oligo-
under: sub-
below: sub-
from: de-
out of: de-
remove: de-
water: hydro-
flesh: carn-
animal: zoo-/zoa-
killer: -cide
self: auto-
between: inter-
other: hetero-
food/nourishment: troph
heat: calor-
beyond: ultra-
within: intra-
light: photo-
alongside: para-

Explanation:

Since scientific terms are harder to understand, some common prefixes (word added to beginning of another) , suffixes (word added at the end) and root words can be used to correctly guess the meaning of a biological term. Most of the terms have been derived from ancient Greek and Roman words.

The prefix omni- means all. E.g, an omnivore is a type of animal that eats both plants and animals.
Prim- is a prefix that means first or foremost. In some cases, it also means basic or fundamental. E.g the primal instincts of any animal are its basic and innate characteristics.
Vor is a suffix that mean eat or devour. E.g, carnivore is an animal that eats meat.
Oligo is a prefix that means few or little. E.g, oligosaccharide is a carbohydrate containing few sugar molecules.
The prefix sub- means both under and below. E.g, subcutaneous means under the layer of the skin.
The prefix sub- means both under and below. E.g, subcutaneous means under the layer of the skin.
The prefix de- means remove, away from or down. E.g to degrade means to break down or break away.
The prefix de- means remove, away from or down. E.g to degrade means to break down or break away.
The prefix de- means remove, away from or down. E.g to degrade means to break down or break away.
The prefix hydro means water. E.g, hydroelectric power is energy derived from water.
Carn is a prefix that means flesh or meat. E.g, a carnivore is an animal that eats meat.
The prefix zoo or zoa defines an animal or of animal origin. E.g, zoology i.e. the study of animals.
The suffix, -cide means to kill or destroy. E.g, fungicide is a chemical that kills fungi.
Auto is a prefix that means self. E.g, autophagy is the pahgocytosis or engulfing of the body cells by other cells of the body.
Inter is a prefix that means between. E.g, intercellular means between the cells.
The prefix heter or hetero means different or other. E.g, heterogeneous is a type of mixture that contains different types of elements.
Troph is a suffix that means feed or nutrition or nourishment. E.g, autotroph is an organism that produces its food by itself.
Calor means heat. E.g, calorimeter is an instrument that measures heat or change in heat.
Ultra is a prefix that mean beyond. E.g, ultrasonics are sound waves that are beyond the audible hearing range.
Intra is a prefix that means within. E.g, intracellular means within or in the cell.
Photo is a prefix that means light. E.g, photosynthesis is a process that plants use to make food by capturing light.
Para is a prefix that means beside, near, equal or alongside. E.g parathyroid is a gland near the thyroid gland.

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Explanation:

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