Muscle tissue has the ability to contract and relax due to its property of excitability, which allows muscle cells to respond to stimuli and generate electrical signals. This contraction and relaxation are initiated by action potentials and the release of ATP (adenosine triphosphate) in muscle fibers. After contraction, relaxation occurs by removing calcium ions from the muscle fibers.
The ability of muscle tissue to contract and relax is due to its unique property called excitability. Excitability refers to the ability of muscle cells, also called muscle fibers, to respond to stimuli and generate electrical signals. These electrical signals, known as action potentials, are responsible for initiating the contraction and relaxation of muscle tissue.
When a muscle fiber receives a stimulus, it releases calcium ions and generates an action potential. This action potential spreads along the muscle fiber, resulting in the release of stored energy in the form of ATP (adenosine triphosphate). This energy is used by the muscle fibers to convert chemical energy into mechanical energy, leading to muscle contraction.
After contraction, muscle fibers need to relax. This relaxation process involves the removal of calcium ions from the muscle fibers, allowing them to return to their resting state. The ability of muscle tissue to contract and relax enables it to perform essential functions such as movement, posture maintenance, and organ control.
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The key property of muscle tissue that allows it to contract and relax is contractility. Muscles also have the properties of extensibility and elasticity which allow them to stretch or extend and return to their original length respectively. The functionality of these properties is seen across three types of muscle tissue: skeletal, cardiac, and smooth.
The property of muscle tissue that gives it the ability to contract and relax is known as contractility. This property allows muscle tissues to pull on their attachment points and shorten with force. In addition, muscles have two other notable properties, specifically, extensibility and elasticity. Extensibility enables a muscle to extend or stretch, while elasticity allows the muscle to return to its original length after it has contracted or stretched. These three properties work in combination to facilitate the smooth movement of muscles.
Three types of muscle tissue exist in the human body: skeletal, cardiac, and smooth muscle. Skeletal muscle is primarily responsible for voluntary movements, cardiac muscle causes the heart to beat, and smooth muscle is involved in involuntary movements such as the contraction of our pupils in bright light or the peristaltic movements in our intestines.
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Red blood cells are disc shaped. It is thought one factor that allows them to have this shape is because they do not have a nucleus. This tends to increase amount of space inside the cell for hemoglobin.
They have a flexible disc shape which helps increase the surface- to- area volume ratio which enables oxygen and carbon dioxide to diffuse across the red blood cell's plasma membrane more readily.
Their disc shape also enables them to squeeze through tiny capillaries that are half their size .
Answer:
The correct answer is CONCAVE because they don't have a nucleus. I just took the test!
Explanation:
The neutral nature of water changes due to mixing of various salts, bases, and acids, thus changing its pH.
The neutral nature of water changes due to mixing of other neutral substances, thus changing its pH.
Answer:
Option B, The neutral nature of water changes due to mixing of various salts, bases, and acids, thus changing its pH.
Explanation:
Water obtained from natural sources like underground water, sea water, rain water etc are not neutral in nature. This is so because water extracted from all these sources contains several dissolved salts/chemical components which either reduces or increases their pH.
The ground water contains lot of dissolved carbonates and bicarbonates (as it remains in contact of rocks beneath the earth) due which it becomes extremely hard and has a pH greater than 7. On the other hand rain and snow water are acidic in nature and have a pH between 5 to 6.
Thus, it is only due to the dissolved bases and acids in natural water which makes it either acidic or basic in nature.
gene expression.
a feedback mechanism.
natural selection.
a learned behavior
The scenario described is an example of a feedback mechanism, which is the second option, as a feedback mechanism is a process in which the output or result of a system or process feeds back into the system and influences the input or process.
A feedback mechanism is a process in which the output or result of a system or process feeds back into the system and influences the input or process. In this case, the rise in blood sugar levels triggers the release of the hormone insulin from the pancreas, which then acts to lower blood sugar levels by increasing the movement of sugar out of the blood. This feedback mechanism is essential for maintaining the body's blood sugar levels within a healthy range. When blood sugar levels rise too high or fall too low, the feedback mechanism is triggered to bring the levels back to equilibrium.
Hence, The scenario described is an example of a feedback mechanism, which is the second option
Learn more about the feedback mechanism here.
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Answer:
a feedback mechanism.
Explanation:
I answered it in study island and it was correct
higher rates of reproduction
more susceptibility to antibiotics
greater genetic variation
Bacterial genetic recombination is characterized by DNA transfer from one organism called donor to another organism as the recipient and the result is the production of genetic recombinants, individuals. Those recombinant bacteria have a greater genetic variation because they carry, not only the genes they inherited from their parent cells but also the genes introduced to their genomes. There are three types of mechanisms that create genetic variations in bacteria (through recombination):
1. Transformation-that occurs when bacterium takes up a piece of DNA floating in its environment,
2. Transduction-occurs when DNA is accidentally moved from one bacterium to another by a virus (bacteriophage) and
3. Conjugation- when DNA is transferred from one bacteria to another through a tube between cells.
Those mechanisms of genetic recombination together with short generation time and random mutations allow bacteria to evolve very quickly and for example, create resistance to antibiotics.