<span>DIAPHRAGM. Actually the diaphragm is strongly attached to the base of sternum, then spine and also the ribcage at lower parts, So when diaphragm contracts, the length gets increases and also the diameter of chest, which expands the lungs, where the intercostal muscles controls and helps to move the ribcage and support in breathing, hence controls the size of the chest cavity.</span>
The arranged events in respect to the function of the channels, ion permeability, and changes in membrane potential from top to bottom include:
1. opening of voltage-gated Na+ channels
2. Na+ ion flow into the neuron increases
3. depolarization of the membrane to +30 mV
4. K+ ion flow out of the neuron increases
5. repolarization of the membrane.
<h3>What is Membrane potential?</h3>
This is defined as the difference in electric potential between the interior and exterior parts of a biological cell and also refers to the potential gradient which facilitates the movement of ions in a cell in one direction.
In a cell, the series of events which occur according the variables such as ion permeability is opening of voltage-gated Na+ channels and is usually ended by the repolarization of the membrane.
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Answer:
The sentences can be completed as follows:
The enzyme lactase breaks down the sugar lactose.
If the body doesn’t produce much of this enzyme, people have what’s called lactose intolerance.
During the chemical reaction the enzyme doesn’t get used up, but gets reused.
Enzymes are substances that speed up chemical reactions which are also known as catalysts.
Explanation:
Enzymes can be described as molecules which act as biological catalysts i.e they are involved in speeding up a chemical reaction. The enzymes do not get used up in a chemical reaction and hence, they can be reused.
Lactase is an enzyme which helps in breaking down the sugar lactose which is commonly found in the milk. If enough lactase is not produced by a person's body, then he/she becomes unable to digest the sugar lactose. Such a condition is known as lactose intolerance.
Answer:
last one
Explanation:
because they have no nucleus of any membrane bound organelles
