The combination of Hemoglobin with Oxygen in the blood can be promoted by

Correct Answer: B

Rationale: The correct answer is B: Increasing O2 concentration. When O2 concentration increases, it promotes the binding of oxygen to hemoglobin in the blood through the process of oxygenation. This results in the formation of oxyhemoglobin, which enhances oxygen transport in the blood. Summary: - A: Decreasing O2 concentration would hinder the binding of oxygen to hemoglobin, reducing oxygen transport efficiency. - C: Increasing CO2 concentration would lead to the formation of carbaminohemoglobin, not oxyhemoglobin. - D: Decreasing CO2 concentration would not directly promote the binding of oxygen to hemoglobin.

Correct Answer: C

Rationale: Rationale: C is correct because the spleen is a secondary lymphoid organ, not a primary one. The spleen filters blood, not lymph fluid. A is correct as the spleen is located in the described position. B is correct as the splenic vessels do communicate with the spleen at the hilum. D is correct as lymphocytes and dendritic cells are indeed concentrated in the white pulp. Summary: A, B, and D are correct statements about the spleen. C is incorrect because the spleen is a secondary lymphoid organ, not a primary one.

Correct Answer: C

Rationale: Henry's law states that the volume of gas dissolved in a solvent is directly proportional to the partial pressure of the gas above the solvent. This means that as the gas pressure increases, more gas will dissolve in the solvent. Choice C correctly describes this relationship between gas pressure and gas solubility in a solvent. Choices A and B are not related to Henry's law. Choice D is incomplete and does not provide any relevant information about Henry's law.

Correct Answer: A

Rationale: The correct answer is A because at higher temperatures, oxygen dissociation from hemoglobin increases, leading to lower oxygen saturation. This is due to the Bohr effect, where increased temperature shifts the hemoglobin-oxygen dissociation curve to the right. Therefore, the percent of oxygen saturation is greater at 38 degrees Celsius compared to 43 degrees Celsius. Choice B is incorrect because higher temperatures decrease oxygen saturation. Choice C is incorrect as the saturation is not equal at different temperatures due to the Bohr effect. Choice D is incorrect because the saturation at 20 degrees Celsius would be higher than at 38 degrees Celsius.

Correct Answer: C

Rationale: The correct answer is C, vagus and glossopharyngeal nerves. Chemoreceptors in the carotid bodies and aortic bodies detect changes in blood chemistry and send signals to the brainstem. The glossopharyngeal nerve carries signals from the carotid bodies, while the vagus nerve carries signals from the aortic bodies. These signals are crucial for regulating breathing and maintaining homeostasis. The other choices, trigeminal (A) and hypoglossal (B) nerves, are not involved in transmitting signals from chemoreceptors to the brain. Choice D, glossopharyngeal nerve alone, is not correct as both glossopharyngeal and vagus nerves are involved in this process.