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defon
2 years ago
11

When igneous rock is formed,the size of the rock crystals or grains is primarily dependent on

Biology
1 answer:
Vedmedyk [2.9K]2 years ago
3 0

Answer:

The three factors that influence the textures of igneous rocks are the speed of cooling, the silicate content, and the water content.

Igneous rocks contain randomly arranged interlocking crystals. The size of the crystals depends on how quickly the molten magma solidified: magma that cools slowly will form an igneous rock with large crystals. lava that cools quickly will form an igneous rock with small crystals. When magma cools, crystals form because the solution is super-saturated with respect to some minerals. If the magma cools quickly, the crystals do not have much time to form, so they are very small. If the magma cools slowly, then the crystals have enough time to grow and become large.

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Neurotransmitters categorized as inhibitory are expected to _______. A. act independently of their receptor proteins B. close po
Ksenya-84 [330]

The correct option is D.

Neurotransmitters categorized as inhibitory are expected to hyperpolarize the membrane.

At inhibitory synapses, release of neurotransmitters causes inhibitory postsynaptic potentials or IPSP, which is a hyperpolarization of the presynaptic membrane.

Actually, depolarization and hyperpolarization occurs on neuron when an ion channel in the membrane open or close which can alter the ability of certain types of ions which enter from or exit out of the cell.

Neurotransmitters which is inhibitory have inhibitory effects on the neuron as it means they can decrease the possibility that the neuron will tend to fire an action. Modulatory neurotransmitters can also affect various neurons at the same time which results in the influencing effects of other chemical messengers.

Inhibitory neurotransmitter somehow decreases the action potential of the neuron. When the action potential falls below a certain level which is called threshold potential, the neuron will not be able to generate action potentials and thereby unable to exit the nearest neurons.

So, neurotransmitters are in general expected to hyperpolarize the membrane in some extent.

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6 0
2 years ago
The Precambrian time period is the largest on the geological time scale. Please select the best answer from the choices provided
Sedaia [141]

Answer:

True

Explanation:

Precambrian, period of time extending from about 4.6 billion years ago (the point at which Earth began to form) to the beginning of the Cambrian Period, 541 million years ago. ... The Precambrian represents more than 80 percent of the total geologic record.

3 0
3 years ago
Why does the moon appear to change shape during a month?
zubka84 [21]
The moon does not create its own light, but the sun reflects light of the moon so depending on where the sun sits (which it is always moving) causes the different phases or appearances to the moons shape
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In the carbon cycle, carbon is taken in by plants A) as ammonia in the process of assimilation B) as carbon dioxide in the proce
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<h2>As carbon dioxide in the process of photosynthesis</h2>
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A type of lymphocyte called a(n) ________ detects cells with abnormal surface proteins and kills them.
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A type of lymphocyte called  NK cell detects cells with abnormal surface proteins and kills them.

<h3>What are lymphocytes?</h3>

One variety of white blood cell is the lymphocyte. They are crucial to the functioning of your immune system, which aids in the body's defense against sickness and infection. An extensive network of immune cells, lymph nodes, lymph tissue, and lymphatic organs makes up your immune system. Immune cells include lymphocytes. The two primary categories of lymphocytes are:

T lymphocytes (T cells): T cells direct your body's immune response and actively hunt down and destroy cancerous and infected cells.

B cells, or B lymphocytes: The B cell produces antibodies. Proteins called antibodies hunt down viruses, bacteria, and other foreign invaders.

Your body's immune system uses lymphocytes to combat cancer and invading viruses and germs (antigens). Your immune system benefits from lymphocytes' assistance in retaining every antigen it encounters. Some lymphocytes develop into memory cells after an encounter. Memory cells detect an antigen and reactbwhen they come into contact with it again. You don't contract illnesses like measles or chickenpox repeatedly because of this. Additionally, it explains why some diseases can be avoided through vaccination.

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7 0
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