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Why do you think this change in levels occurs the oxygen levels as blood passes through the lungs?

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter10: The Respiratory System

Section: Chapter Questions

Problem 6SQ: Breathing _______. a. ventilates the lungs b. draws air into airways c. expels air from airways d....

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Concept explainers

Homeostasis

Homeostasis is a self-regulatory process through which different biological systems maintain constant internal environmental conditions to compensate for environmental changes. In human physiology, it is a process of self-regulating internal, chemical, and physical conditions at an optimal level for survival. The stability through homeostasis can be attained through dynamic equilibrium, in which there is a continuous change until it reaches its systemic conditions.

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Breathing _______. a. ventilates the lungs b. draws air into airways c. expels air from airways d. causes reversals in pressure gradients e. all of the above
A partial pressure gradient of oxygen exists between ________. a. air and lungs b. lungs and metabolically active tissues c. air at sea level and air at high altitudes d. all of the above
why do oxygen levels decrease
(a) The partial pressure of CO2 in the lungs can be varied rapidly by the rate and depth of breathing. For example, a common remedy to alleviate hiccups is to increase the concentration of CO2 in the lungs. This can be achieved by holding one’s breath, by very slow and shallow breathing (hypoventilation), or by breathing in and out of a paper bag.Under such conditions, pCO2 in the air space of the lungs rises above normal. Qualitatively explain the effect of these procedures on the blood pH.(b) A common practice of competitive short-distance runners is to breathe rapidly and deeply (hyperventilate) for about half a minute to remove CO2from their lungs just before the race begins. Blood pH may rise to 7.60. Explain why the blood pH increases.(c) During a short-distance run, the muscles produce a large amount of lactic acid (CH2CH(OH)COOH; K2 = 1.38 × 10 –4 M) from their glucose stores. Why might hyperventilation before a dash be useful?
Oxygen and carbon dioxide diffuse across our respiratory surface into and out of the blood via simple diffusion. The respiratory membrane is thin so gases diffuse only a short distance through the liquid and into the blood. Fluid buildup in the lungs increases the distance through the liquid medium. How does this impact the concentration of oxygen in the blood? Explain.
When the blood passes through the lungs, CO₂ is expelled and the hemoglobin picks up oxygen. Place the following steps in the correct order (1 = first thing to happen), assuming that it is the decreased [CO₂] during exhalation that initiates the transition. Carbonic anhydrase works to restore the CO₂/bicarbonate equilibrium, reducing the [H+] The T-state is less stabilized. Oxygen binds to the hemoglobin. Protons dissociate from the hemoglobin.
If the partial pressure of oxygen in inhaled air was 80 mm Hg instead of 160 mm Hg, what would be the impact on oxygen transport in the body? Be sure to explain this in detail and to be clear about what you think will happen in all parts of the transfer of oxygen throughout the body.
You are studying with a friend who is describing the Bohr effect. She tells you that in the lungs, hemoglobin binds oxygen and releases hydrogen ion; as a result, the pH increases. She goes on to say that in actively metabolizing muscle tissue, hemoglobin releases oxygen and binds hydrogen ion and, as a result, the pH decreases. Do you agree with her reasoning? Why or why not?
How does the concept of partial pressure explain the diffusion of oxygen into our blood stream? Why does this become more difficult at high altitudes?
With the Bohr effect, more oxygen is released to the tissues because: a decrease in pH weakens the hemoglobin-oxygen bond a decrease in pH strengthens the hemoglobin-oxygen bon Oan increase in pH strengthens the hemoglobin-oxygen bond an increase in pH weakens the hemoglobin-oxygen bond
Why do we breathe oxygen and exhale carbon dioxide?
Which of the following statements about oxygen transport is TRUE. Increases in temperature and decreases in pH cause myoglobin to release oxygen to improve delivery to the hemoglobin in muscles. A molecule of myoglobin has higher oxygen binding capacity than a molecule of hemoglobin. Myoglobin has a higher oxygen affinity than does hemoglobin. Fetal hemoglobin has a lower affinity for oxygen than maternal hemoglobin, which makes it better suited to extract oxygen from the maternal circulation.