Answer:
They lie flat when we are warm, and rise when we are cold. The hairs trap a layer of air above the skin, which helps to insulate the skin against heat loss. For example, if we become too cold, the hair erector muscles contract.
Explanation:
Answer:
d increase of antibiotic resistance in bacteria
Explanation:
Increasing number of antibiotic resistance in bacteria reinforces Darwin's idea of evolution by natural selection.
Charles Darwin was one of the foremost scientist that researched about evolutionary trends in organisms.
One of his revolutionary works is the idea of natural selection. In natural selection, certain phenotype are favored due to environmental influence and this makes them have evolutionary advantages.
He suggested that organisms that have evolved certain genetic make up will survive competition and would naturally be favored.
Increasing antibiotic resistance in bacteria is one of such example.
Answer:
<h3>A. </h3>
Explanation:
<h3>Tutorial</h3><h3>Diffusion</h3><h3>Diffusion means that the net movement </h3><h3>of particles (molecules) is from an area of high concentration to low concentration.</h3>
<h3>Graph of the simple and facilitated diffusion taking into account the rate of uptake and the concentration</h3>
<h3>If the particles can move through the lipid bilayer by simple diffusion, then there is</h3><h3> no limit to the number that can fit </h3><h3>through the membrane. The rate of diffusion increases linearly as we add </h3><h3>more particles to one side of the membrane.</h3>
<h3>If the particles can only pass through protein channels, then the rate of </h3><h3>diffusion is determined by the number of channels as well as the number of particles.</h3>
<h3>Once the channels operate at their maximal rate, a further increase in </h3><h3>particle numbers no longer increases the apparent rate of diffusion. At this limited rate we describe the protein channel as being saturated.</h3>
<h3>The cartoon illustrates several points about facilitated diffusion. The particles are more concentrated on one side of the membrane, and yet they can move in both directions. However, the net movement is from high particle concentration to low. If the number of particles gets so high on one side of the membrane that they</h3><h3> interfere with diffusion through the </h3><h3>protein channel, then we observe a limit to the rate of diffusion at the point of saturation.</h3>
<h3>Illustration of facilitated diffusion</h3><h3>animation used with permission of the Virtual Cell Web Page</h3><h3>Problem 7 | Answer | Problem 8</h3><h3>The Biology Project > Cell Biology > Cell Membranes > Problem Set</h3>
<h3>The Biology Project</h3><h3>Department of Biochemistry and Molecular Biophysics</h3><h3>University of Arizona</h3><h3>May 2002</h3><h3>Revised: August 2004</h3><h3>Contact the Development Team</h3>
<h3>Simple diffusion does not require energy: facilitated diffusion requires a source of ATP. Simple diffusion can only move material in the direction of a </h3><h3>concentration gradient; facilitated </h3><h3>diffusion moves materials with and against a concertion gradient. </h3>
Some you wouldn't see by stepping outside, but it gives you a general understanding of what you should be looking for.
Hope this helps!
Nerve impulses are signals that are transmitted along nerve fibers of the body.
<h2>
Nerve impulses are electrical impulses. They are generated in response to stimuli.</h2>
These electrical impulses create:
- action potentials as waves of depolarization that moves along the axons.
The axons contain voltage-gated ion channels that are either opened or closed by depolarization (which is the opening of ion channels leading to changes in membrane potential)
Depolarization further causes other channels to open and close thus spreading across the entire length of the axon and into another nerve cell (neuron).
Myelin sheaths act as buffers and through salt conduction help increase the speed of electrical impulses through the neurons. Not every nerve cell is insulated with a myelin sheath.
To learn more about neurons see: brainly.com/question/24217914?referrer=searchResults
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