Explanation:
A body cavity is any space or compartment, or potential space, in an animal body. Cavities accommodate organs and other structures; cavities as potential spaces contain fluid. The two largest human body cavities are the ventral body cavity, and the dorsal body cavity.
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The sociocultural perspective would focus on the fact that he has found himself in a new environment which has diferent social and cultural traditions compared to his own environment.
The psycodynamic perspective would focus on his early childhood traumas and defensive mechanisms.
The behavioral perspective would talk about ways how he could change his behavior for it to be more desirable to his parents.
The humanistic perspective would talk about him as a complete human being and how he should value himself.
Traits psychology would talk about his traits which have gotten him to his point and his current situation.
Answer:
Option). about 20 percent of the calcium ion required for contraction comes from outside the cell.
Explanation:
Calcium ions play an important role in cardiac muscle physiology. Calcium ions influx is responsible for plateau phase after depolarization. Calcium ions also play role in muscle contraction with the help of troponin (regulatory protein).
For contraction, about 20 percent of calcium ions are supplied from outside of the cell, while rest of the calcium ions are released from SR (sarcoplasmic reticulum).
Thus, the correct answer is 'forth option.'
