Answer: The relationship between blood pressure and heart rate responses to coughing was investigated in 10 healthy subjects in three body positions and compared with the circulatory responses to commonly used autonomic function tests: forced breathing, standing up and the Valsalva manoeuvre. 2. We observed a concomitant intra-cough increase in supine heart rate and blood pressure and a sustained post-cough elevation of heart rate in the absence of arterial hypotension. These findings indicate that the sustained increase in heart rate in response to coughing is not caused by arterial hypotension and that these heart rate changes are not under arterial baroreflex control. 3. The maximal change in heart rate in response to coughing (28 +/- 8 beats/min) was comparable with the response to forced breathing (29 +/- 9 beats/min, P greater than 0.4), with a reasonable correlation (r = 0.67, P less than 0.05), and smaller than the change in response to standing up (41 +/- 9 beats/min, P less than 0.01) and to the Valsalva manoeuvre (39 +/- 13 beats/min, P less than 0.01). 4. Quantifying the initial heart rate response to coughing offers no advantage in measuring cardiac acceleratory capacity; standing up and the Valsalva manoeuvre are superior to coughing in evaluating arterial baroreflex cardiovascular function.
Explanation:
Answer:
Cellular respiration uses oxygen and releases carbon dioxide, while photosynthesis uses carbon dioxide and releases oxygen.
Explanation:
Eukaryotic cells that contain more than two sets of genetic information are referred to diploid (option B).
<h3>What is a diploid cell?</h3>
A diploid cell is a cell, having a pair of each type of chromosome, one of the pair being derived from the ovum and the other from the spermatozoon.
On the other hand, a haploid cell is a cell having a single set of unpaired chromosomes.
Most somatic cells of higher organisms are diploid in number, meaning that they contain two sets of chromosomes in their cells.
Therefore, eukaryotic cells that contain more than two sets of genetic information are referred to diploid.
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The conditions which describe the partial pressures of systemic cells under resting conditions are:
- Relatively constant partial pressure of gases
- PCO₂ of 45mm Hg, and
- PO₂ of 40mm Hg
<h3>What are systemic cells?</h3>
Systemic cells are cells of the body which receive oxygen from the capillaries during respiration and gaseous exchange.
The systemic cells receive oxygen-laden blood from the capillaries and transfer carbon dioxide into the blood capillaries.
The conditions which describe the partial pressures of gases of systemic cells under resting conditions are as follows:
- Relatively constant partial pressure of gases
- Partial pressure of carbon dioxide, PCO₂ of 45mm Hg, and
- Partial pressure of oxygen, PO₂ of 40mm Hg
In conclusion, the partial pressure of the gases in systemic cells under resting conditions are fairly constant.
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