The atrioventricular (AV) node is located in the
A. floor of the left atrium.
B. floor of the right atrium.
C. back wall of the right ventricle.
D. roof of the left ventricle.
E. back wall of the left ventricle.
Answer: B
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Which is the correct order in the flow of tears?
a) Lacrimal gland, lacrimal sac, lacrimal duct, superior or inferior lacrimal canal, nasolacrimal duct, nasal cavity b) Lacrimal gland, lacrimal duct, superior or inferior lacrimal canal, nasolacrimal duct, lacrimal sac, nasal cavity c) Lacrimal gland, lacrimal duct, nasolacrimal duct, superior or inferior lacrimal canal, lacrimal sac, nasal cavity d) Lacrimal gland, lacrimal duct, superior or inferior lacrimal canal, lacrimal sac, nasolacrimal duct, nasal cavity e) Lacrimal gland, lacrimal sac, nasolacrimal duct, superior or inferior lacrimal canal, lacrimal duct, nasal cavity
The correct sequence for the conducting system is:
a. sinoatrial node, AV bundle, Purkinje fibers, bundle of His b. sinoatrial node, AV node, AV bundle, Purkinje fibers c. sinoatrial node, bundle of His, AV bundle, Purkinje fibers d. sinoatrial node, Purkinje fibers, AV bundle, AV node
The segment of the DNA molecule where messenger RNA synthesis begins is called the
promoter region. sigma factor. transcription terminator. polymerase. template.
Why do signs and symptoms of decreased thyroxine concentration not appear until about a week after a thyroidectomy (surgical removal of the thyroid gland)?
A) About a week's worth of thyroxine is stored in the liver. B) About a week's worth of thyroxine is stored in the anterior pituitary gland. C) Most of the thyroxine is bound to proteins in the bloodstream and the hormones are released gradually. D) The parathyroid glands can take over function of the thyroid gland for a short period of time. E) The anterior pituitary gland can start producing thyroxine.