For each movement (or result of movement) described in the first column, select the correct acting muscle from the options that performs the movement (or leads to the result)
For each movement (or result of movement) described in the first column, select the correct acting muscle from the options that performs the movement (or leads to the result), some of the options may not be used and some of them may be used more than once.
1. Increase in the intra-abdominal pressure.
2. Elevation of the ribs during deep inspiration.
3. Fixation of the 1st rib during deep inspiration.
4. Increase in the vertical dimension of the thorax.
5. Decrease in the vertical dimension of the thorax.
6. Maintaining the intercostal space during inspiration.
7. Maintaining the intercostal space during expiration.
a. Trapezius.
b. Pectoralis minor.
c. Scalenus anterior.
d. Contracted diaphragm.
e. Relaxed of the diaphragm.
f. Internal intercostal muscle.
g. External intercostal muscle.
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