Why does the inferred appearance of a diaphragm in cynodonts make sense in terms of other attributes of these synapids?
What will be an ideal response?
There are other features of the cynodont skeleton (e.g., maxillary turbinates) that indicate at least some degree of endothermy in cynodonts. The diaphragm helps with ventilation, and endotherms require an increased rate of ventilation to supply their cells with sufficient oxygen for their higher metabolic rate.
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The walls of the alveoli are composed of two types of cells, type I and type II. The function of type II is to ________.
A) secrete surfactant B) trap dust and other debris C) replace mucus in the alveoli D) protect the lungs from bacterial invasion
The ________ subdivides the pelvis into the "true pelvis" and the "false pelvis".
A. pelvic outlet B. pelvic brim C. sacral promontory D. pubic symphysis E. pelvic inlet
Where do the auditory tubes enter the skull?
A) stylomastoid foramen B) supra-orbital foramen C) foramen magnum D) foramen lacerum
Which muscle acts as an antagonist to rectus abdominis?
A. Trapezius B. Splenius capitis C. Erector spinae D. Transversus abdominis E. Sternocleidomastoid