Human Physiology Week 10d.14-g.20

Play an AI-generated podcast conversation about this lesson

What physiological change during exercise causes hemoglobin to release oxygen based on temperature?

Increased oxygen demand

Increased temperature of active muscles (correct)

Increased production of ATP

Increased muscle contraction

Which of the following factors promotes hemoglobin's release of oxygen during exercise through pH changes?

Production of hydrogen ions from glycolysis (correct)

Reduction of hydrogen ions

Increase in muscle pH

Stabilization of blood pH

What is the significance of carbon dioxide levels in the context of hemoglobin's oxygen release during exercise?

Lower carbon dioxide levels stimulate oxygen retention

Carbon dioxide levels fluctuate with oxygen transport

Increased carbon dioxide levels promote oxygen release (correct)

Higher carbon dioxide levels support oxygen binding

Which process primarily generates hydrogen ions during physical exertion?

Glycolysis Signup and view all the answers

How does the byproduct of ATP breakdown influence hemoglobin's affinity for oxygen?

It increases oxygen release due to raised temperature Signup and view all the answers

What effect does an increase in carbon dioxide levels have on hemoglobin's binding affinity for oxygen?

It weakens the binding affinity, facilitating better oxygen delivery. Signup and view all the answers

A rightward shift in the oxyhemoglobin dissociation curve is most likely to occur under which conditions?

Increased carbon dioxide levels and decreased pH. Signup and view all the answers

Which physiological state would most likely cause a leftward shift in the oxyhemoglobin dissociation curve?

Increased pH and low carbon dioxide. Signup and view all the answers

How does hemoglobin saturation change when partial pressure of oxygen decreases significantly from 100 to 65?

It only slightly decreases to around 90% saturation. Signup and view all the answers

What is the primary role of hemoglobin in the body's oxygen transport system?

To bind to oxygen and transport it, maintaining high saturation under varying conditions. Signup and view all the answers

What is the approximate saturation percentage of hemoglobin in venous blood at rest?

75% Signup and view all the answers

How does the partial pressure of oxygen in arterial blood compare to that in venous blood?

It is significantly higher in arterial blood. Signup and view all the answers

What effect does high-intensity exercise have on the oxygen saturation of venous blood?

Decreases it substantially. Signup and view all the answers

Which of the following statements about the oxyhemoglobin dissociation curve is true?

Lower partial pressures make it easier for hemoglobin to release oxygen. Signup and view all the answers

What is the approximate partial pressure of oxygen in arterial blood under normal conditions?

100 mmHg Signup and view all the answers

What effect does a decrease in carbon dioxide levels have on hemoglobin's affinity for oxygen in the lungs?

It increases hemoglobin's affinity for oxygen. Signup and view all the answers

During exercise, which of the following factors causes hemoglobin to release oxygen more readily at the working muscles?

Increased carbon dioxide and increased hydrogen ions. Signup and view all the answers

What occurs to hydrogen ions in the blood when bicarbonate is converted back to carbon dioxide and water in the lungs?

They decrease, leading to an increase in blood pH. Signup and view all the answers

Which statement best describes the physiological changes in blood when it circulates in the lungs?

The blood cools down and releases carbon dioxide. Signup and view all the answers

Which condition leads to hemoglobin preferentially releasing oxygen during active muscle metabolism?

A decrease in pH due to increased hydrogen ions and carbon dioxide. Signup and view all the answers

Human Physiology Week 10d.14-g.20 - Transcripts

Choose a study mode

Podcast

Questions and Answers