An atom of iron has an atomic number of 26. Which of the following is TRUE?

A) Iron has 13 protons and 13 electrons. B) Iron has 26 protons.
C) Iron has 13 electrons. D) Iron has 13 protons and 13 neutrons.


Answer: B

Anatomy & Physiology

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In treating a burn patient, the "rule of nines" is used to estimate the

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Identify the process featured in the image.


A) translation
B) replication
C) transcription
D) mitosis
E) meiosis

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Calcium is a bivalent ion that is responsible for neuromuscular transmission, cell membrane permeability, hormone secretion, and:

a. Bronchial constriction b. Production of ADH c. Release of chorionic gonadotropin d. Smooth muscle contraction

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Chemicals that signal the same cell that made them are called ________ messengers, while those that signal nearby cells are called_____ messengers.

A. paracrine; endocrine B. autocrine; paracrine C. endocrine; pheromone D. allomone; autocrine E. pheromone; prostaglandin

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