The lungs and the mouth... and the wind pipe!
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Answer:
b.
Explanation:
The brain is an organ with no actual muscle except for the muscle tissue in the middle layer of the arteries that carry blood of the brain
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Answer:
Sedimentary rock is conglmerate
Answer
Frequency of stimulus can change the force of muscle twitch.
Explanation
Twitch is tension produced by the contraction of a small muscle or it is muscle fasciculation. Its strength depends on the stimulation frequency. If the frequency is higher then temporal summation takes place and produce higher tension in the muscle. If the frequency is weak then less tension is produced in the muscle. This force also depends on the cross-sectional area of muscle.
Answer:
Enzymes are biological catalysts. Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy.
