Describe the mechanics of ventilation
What will be an ideal response?
Air moves into and out of the lungs due to pressure gradients between the lungs and atmosphere. During inspiration the diaphragm and external intercostal muscles contract, increasing the volume and decreasing the pressure within the lungs. Intra-alveolar pressure drops below atmospheric pressure and air enters the lungs down the pressure gradient. The opposite happens during expiration. These muscles relax, decreasing the volume and increasing the intra-alveolar pressure above atmospheric pressure. This forces air out of the lungs as it moves down the pressure gradient
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A drug that might be used specifically to reduce heart rate in cardiac patients could be ________.
A) anticholinesterase B) epinephrine C) norepinephrine D) a beta-blocker
Which of the following is consistent with homeostasis?
A. As blood pressure falls, blood flow to the heart decreases. B. As body temperature rises, sweating occurs to cool the body. C. When a person drinks large quantities of water, urine output decreases to raise blood volume. D. Decreases in blood pressure cause a corresponding decrease in heart rate. E. Elevated blood glucose levels cause insulin secretion to decline.
The merging of ________ forms the right lymphatic duct
A) the right jugular, right subclavian, and right bronchomediastinal trunks B) the left jugular, right subclavian, and right bronchomediastinal trunks C) two great vessels D) the thoracic and mediastinal ducts E) superior and inferior lymphatic ducts
The cervical vertebrae and thoracic vertebrae have transverse foramen.
Indicate whether the statement is true or false.