An isometric contraction is the kind of contraction that leads to development of tension but no increase in length.
An isometric contraction occurs as the muscle produces tension without changing the angle of a skeletal joint. Isometric contraction is a static muscle action that helps to maintain the posture. For example, the antigravity muscles. It occurs in the biceps when the arms may be holding a weight. In such a posture, the biceps enlarge due to holding of weight and produces tension but do no increase in length. It stops the flexion of elbow. In such contraction, no work is done, and lesser amount of heat energy is released in comparison to isotonic contractions.
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Answer: a) Neonate
Explanation:
Neonate is the infant who has been newborn and is less than of four weeks.After a month they are not considered neonate.
According to the question, neonate is described from description as Marcia is a new born infant who is less than of about 28 days .She has amniotic fluids, cheese like substance on body , velvet like like air etc features of newborn.
Other option are incorrect because baby, fetus and infant is not described through the description in the question.Thus, the correct option is option(a).