What moves the food from your mouth to your stomach when you swallow?
A) Gravity
B) Peristaltic muscle contractions
C) Undulatory muscle contractions
D) Pressure difference between zones
B
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Mammals and birds eat more often than reptiles. Which of the following traits shared by mammals and birds best explains this habit?
A) endothermy B) ectothermy C) insulating body cover D) amniotic egg E) terrestrial
What are the results of the release of cAMP from Dictyostelium discoideum?
A. The larger cells cannibalize the smaller, less developed cells. B. Cells aggregate, forming a large motile multicellular slug, precursor to the development of a fruiting body. C. The cells form cysts until the growing conditions improve. D. The cells develop flagella.
Human plasma is mainly composed of:
a. albumin b. red blood cells c. white blood cells d. water e. dissolved ions, sugars, and hormones
When contracted, ________ prevents movement of chyme from the stomach to the small intestine
A) peristalsis
B) reverse peristalsis
C) the epiglottis
D) a sphincter