Which respiratory-associated muscles would contract when you take a deep breath to blow up a balloon? Explain the role of these muscles in pulmonary ventilation
What will be an ideal response?
For a forced or deep inspiration needed to blow up a balloon, the diaphragm and external intercostal muscles contract forcefully to increase the height and diameter of the thoracic cavity, and thus the volume of the lungs. Accessory muscles such as the muscles of the back, neck, and chest will also contract to further increase the size of the thoracic cavity. The increase in lung volume decreases pressure in the alveoli and causes a pressure gradient along which air moves into the lungs.
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What happens if you drink a large amount of water without ingesting anything salty?
A) Osmolarity of body fluid increases B) Urine volume increases C) Blood volume remains unaltered D) Blood pressure decreases
The building blocks for peptides are _______.
A) nucleic and amino acids B) amino acids C) maltose D) nucleic acids E) glucose
Vertebrates have been thought of as "dual animals," consisting of both segmented and unsegmented portions. How is this duality reflected in their embryonic development and the structure of the nervous system?
What will be an ideal response?
(visualize self in raft) You are nearly deafened by the first heart sound, which is caused by
the opening of the atrioventricular valves. the closing of the atrioventricular valves. the opening of the semilunar valves. the closing of the semilunar valves.