Thyroxine cannot be produced without iodine.
a. true
b. false
a. true
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Steroid hormones
A) are proteins. B) cannot diffuse through cell membranes. C) bind to receptors in the nucleus of their target cells. D) act on target cells by activating second messenger cascades. E) are transported in the blood dissolved in the plasma.
Which of the following structures do not contribute to the coarse grainy appearance of the perikaryon of a neuron?
A) mitochondria B) smooth endoplasmic reticulum C) free and fixed ribosomes D) rough endoplasmic reticulum E) All of the answers are correct.
Spaces in the bone matrix that are occupied by osteocytes are ________.
A. lamellae B. periosteum C. trabeculae D. lacunae
What is NOT part of the cardiac conduction system?
A) atrioventricular (AV) node B) sinoatrial sinoatrial (SA) node C) atrioventricular (AV) valve D) atrioventricular (AV) bundle