The epipubic bones of nonplacental mammals have long been thought to have had a reproductive function (e.g., support of the pouch in marsupials)
What evidence do we have that some of their function may be related to locomotion and support of the abdominal wall?
Epipubic bones are lost in the two types of marsupials that evolved a quadrupedal type of cursorial (running-adapted) body form (as opposed to the bipedal stance of kangaroos): the recently extinct thylacines and the extinct South American borhyaenids. The epipubic bones may restrict motions of the trunk and hindlimbs.
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A lack of lung surfactant causes ________ lungs that resist expansion
A) Inflamed B) Infected C) Floppy D) Stiff
The ear opening is shaped like a ________
Fill in the blank(s) with correct word
Which of the following situations occurs in electrically excitable cells?
A. Ligand-gated Na+ channels are opened by high extracellular Ca2+ levels. B. When Na+ channels open, K+ channels close. C. Proteins tend to diffuse out of the cell. D. The sodium-potassium pump moves Na+ into the cell. E. Depolarization causes voltage-gated Na+ channels to open.
What is the most common cell type in the epidermis?
a. macrophages b. dendritic cells c. keratinocytes d. fibroblasts