Delicate unpigmented hairs that cover the fetus in early development are called ________ hairs.
A. secondary
B. terminal
C. lanugo
D. primary
E. vellus
Answer: C
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Which portion of the lacrimal apparatus consists of 2 small pores that drain the tears off of the surface of the eye?
A. Canaliculi B. Lacrimal puncta C. Nasolacrimal duct D. Lacrimal sac E. Lacrimal gland
Norepinephrine and epinephrine are considered to be ________ when released into the bloodstream, but ________ when released at synapses
A) hormones; neurotransmitters B) neuropeptides; neurotransmitters C) neurotransmitters; hormones D) neurotransmitters; neuropeptides E) neuropeptides; neurohormones
An enzyme is substrate-specific because of the shape of its ________.
A. alpha chain B. receptor C. terminal amino acid D. secondary structure E. active site
Which system is a functional system, not an organ system in the anatomical sense, that consists of innate and adaptive defense mechanisms?
A) respiratory system B) lymphatic system C) endocrine system D) immune system E) cardiovascular system