Describe the origins and insertions of the masseter and temporalis muscles. What action do these muscles work synergistically to accomplish?
What will be an ideal response?
The masseter muscle is a thick, band-like muscle that has its origin on the zygomatic arch. It inserts on the angle and lateral surface of the ramus of the mandible. It covers much of the ramus of the mandible. The temporalis muscle is a fan-shaped, convergent muscle that has its origin on and spreads over the flat portion of the temporal bone. It inserts on the coronoid process of the mandible. These two muscles provide much of the force needed for elevating the mandible to bite and chew food.
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In a condition known as pleurisy, there is excess fluid in the pleural space. How would you expect this to affect the process of pulmonary ventilation?
A) Breathing would be labored and difficult. B) It would be easier to expand the lungs on inspiration. C) More air would be forced out during expiration. D) Tidal volume would increase. E) Ventilation would require less energy.
A brush border of microvilli is found in ________ epithelium, which can be found in the ________.
A. simple columnar; small intestine B. stratified squamous; esophagus C. simple cuboidal; esophagus D. pseudostratified; nasal cavity E. stratified squamous; anal canal
Autorhythmic cardiac cells are found in all the following location except the
a. SA node. b. interatrial septum. c. Purkinje cells. d. AV node.
Sympathetic stimulation of the heart causes the heart rate to
A. increase, then decrease. B. increase. C. decrease. D. stay the same.