Microorganisms inhaled into the airways are most likely to be destroyed by:
A. antibodies in respiratory mucus.
B. the cilia whipping them to death.
C. digestion by gastric juice.
D. surfactant.
Ans: C. digestion by gastric juice.
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Which hormone is secreted by the pineal gland?
A. Cortisol B. Melatonin C. Melanin D. Insulin E. Oxytocin
If a nerve cell has a greater concentration of Na+ on the outside and K+ on the inside of
the cell membrane, then the movement of Na+ outside and K+ inside is by diffusion. Indicate whether the statement is true or false
The number of possible combinations of genes in humans is virtually limitless. One reason is random assortment of chromosomes and the other is
A. crossing over. B. spermiogenesis. C. nondisjunction. D. random mating. E. reduction division.
What are the three primary brain vesicles that form from the neural tube?
A) mesencephalon, telencephalon, diencephalon B) midbrain, pons, medulla oblongata C) brainstem, diencephalon, cerebellum D) forebrain, midbrain, hindbrain