All of the following are under dual control of the ANS except
a) Iris
b)heart
c) salivary glands
d)adrenal medulla
e)digestive system
Answer: a) Iris
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The sinusoids of the liver are lined by phagocytic Kupffer cells, also called ________ cells.
Fill in the blank(s) with the appropriate word(s).
Bone growth in length occurs by mitosis of
A) concentric lamellae. B) cartilage cells in the epiphyseal side of the metaphysis. C) growth of trabeculae. D) osteoblasts in the endosteum. E) cartilage cells in the diaphyseal side of the metaphysis.
Once an SA nodal cell reaches threshold, the depolarization phase occurs during which
A. potassium comes in through fast voltage-gated channels. B. calcium comes in through fast voltage-gated channels. C. potassium moves out through fast voltage-gated channels. D. sodium moves out through slow voltage-gated channels. E. calcium moves out through slow voltage-gated channels.
Answer the following statements true (T) or false (F)
1. Microtubules are hollow tubes made of subunits of the protein tubulin. 2. Nitric oxide may act as a biological messenger.