Muscle tone is a state of sustained partial contraction (option D).
Muscle tone in physiology is the continuous and passive partial contraction of the muscles, which helps maintain posture.
Muscle tone aids in holding our bodies upright when sitting and standing. These changes in muscletone are what enable us to move.
For example, if someone took the arm and quickly straightened your elbow, the biceps muscle would automatically and quickly respond and contract in response to protect from injury.
Therefore, option D is correct.
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Answer:
D is the correct answer
The group of organisms that has the derived characteristics of true tissues, bilateral symmetry, and a pseudocoelom is the animalia kingdom. They present all of the mentioned characteristics.
An example of a pseudocoelom is the roundworm.
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Control, constants, independent and dependent variable, experimental and control group are important concepts in an experiment.
Control: In an experiment, the control is the group or condition that does not receive any treatment or manipulation. It serves as a baseline for comparison. Constants: Constants are the factors or conditions that remain the same in both the control group and experimental group(s). They are kept constant to ensure that any observed effects are due to the independent variable only.
Independent Variable: The independent variable is the factor or condition that is intentionally changed or manipulated by the researcher in an experiment. It is the cause of the effect being studied. Dependent Variable: The dependent variable is the factor or condition that is measured or observed in response to changes in the independent variable. It is the effect being studied.
Experimental Group: The experimental group is the group or condition in an experiment that receives the treatment or manipulation of the independent variable. The effects on this group are compared to those of the control group. Control Group: The control group is the group or condition in an experiment that does not receive any treatment or manipulation. It is used as a comparison to assess the effects of the independent variable.
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In experimental design, a control is a benchmark group, constants are factors that remain the same, the independent variable is the manipulated factor, the dependent variable changes in response to the independent variable, an experimental group is exposed to the independent variable, and a control group is not.
These terms you've asked about are all key elements in an experimental design in the area of biology or other sciences. The control refers to a group in an experiment that is not exposed to the treatment or variable being tested, serving as a benchmark to measure how the other tested subjects do. Constants are factors in an experiment that remain the same throughout all experimental groups. The independent variable is the factor that the experimenter manipulates or determines, while the dependent variable is what changes in response to the independent variable. An experimental group is exposed to the independent variable and the control group is not. They are compared to determine the effect of the independent variable. For example, if you were testing if sunlight affects plant growth, the amount of sunlight would be the independent variable, the plant growth would be the dependent variable, the group of plants exposed to sunlight would be the experimental group, the group of plants not exposed to sunlight would be the control group and constants would possibly include the type of plant and watering schedule.
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true=Hormones are chemicals secreted and regulated by the endocrine system.
thyroid
parathyroid
adrenal
The correct answer is adrenal
Adrenal glands are also called suprarenal glands which are located on the kidneys. They produce various hormones including epinephrine (adrenaline). Adrenaline is secreted when a person is under a fight-or-flight. This hormone quickly responds to the emergent situation or threat by increasing heart rate, slowing blood flow to muscle cells and changes other autonomic nervous functions, which gives energy and strength to fight any emergency.