In moving a molecule of oxygen from the air to a muscle cell, which organ system(s) is(are)

involved?



a. respiratory
b. circulatory
c. nervous
d. all of these


D

Biology & Microbiology

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Epidermal placodes are:

A. epidermal thickenings that give rise to integumental coverings such as feathers and hair B. epidermal thickenings that give rise to the lateral line system C. epidermal thickenings that lead to the formation of mesoderm D. epidermal thickenings that give rise to skin glands E. none of the choices provided

Biology & Microbiology

Organisms classified in the same genus share similar characteristics of morphology and are believed to have a common ancestor

Indicate whether the statement is true or false

Biology & Microbiology

Which chemical released by white blood cells causes capillaries to leak?

a. cytokines b. histamine c. interferons d. complement e. interleukins

Biology & Microbiology

The structural building blocks for proteins are ____

a. enzymes b. amino acids c. cholesterol d. polysaccharides e. vitamins

Biology & Microbiology