Select the statement that is true about normal expiration:
A. always a passive process caused by muscle relaxation
B. can be altered by speech or physical activity
C. alveolar pressure is less than atmospheric pressure
D. air flows into the lung
E. occurs as lung volume is increasing
Answer: B. can be altered by speech or physical activity
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The three types of cones that respond to different wavelengths are designated __________.
Fill in the blank(s) with the appropriate word(s).Fill in the blank(s) with the appropriate word(s).
Which of these is demonstrated by the oxygen-hemoglobin dissociation curve?
A. As PO2 increases, the saturation of hemoglobin with oxygen increases linearly. B. At normal resting systemic arterial PO2, hemoglobin is almost 100% saturated with oxygen. C. At normal resting systemic venous PO2, only about 75% of the hemoglobin is in the form of deoxyhemoglobin. D. More additional oxygen binds to hemoglobin when going from a PO2 of 60 to 100 mmHg, than is added when going from a PO2 of 40 to 60 mmHg. E. The greater the PO2 of the blood, the greater the dissociation of O2 from hemoglobin.
The thoracic duct drains lymph from the all the following regions EXCEPT the ________
A) pelvis B) lower limbs C) right upper limb D) abdomen
Delivering single shocks in succession to stimulate the frog heart ______
A) resulted in wave summation B) did not increase the height of the ventricular systole wave C) resulted in fused tetanus D) increased the height of the ventricular systole wave