Briefly explain the function of fontanels and unfused sutures in a fetal skull
What will be an ideal response?
Fontanels and unfused sutures give the fetal skull a significant amount of flexibility. This flexibility ensures that an infant's skull is able to fit through the mother's vaginal canal during birth. The fontanels also allow the skull to enlarge as the infant experiences normal brain growth.
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When EPSPs occurring simultaneously from two different presynaptic inputs add together or sum to bring the postsynaptic cell to threshold, it is called ____________________
Fill in the blank(s) with correct word
Compared to the nervous system, the endocrine system has
A. more localized and short-term effects. B. more widespread and long-lasting effects. C. more localized and long-lasting effects. D. more widespread and short-term effects.
Which of the following is considered to be a positive chronotropic agent?
a. acetylcholine b. sodium channel antagonists c. isoproterenol d. calcium channel blockers
The epithelium of the oesophagus is:
(A) stratified squamous nonkeratinized epithelium (B) stratified squamous keratinized epithelium (C) transitional epithelium of Henle (D) ciliated pseudostratified columnar epithelium