Back to AI Flashcard MakerBiology /Biology IB HL - D6 Gas Transport Part 3
What do the released H+ ions do to the blood?
The released hydrogen ions will function to lower the pH of the solution, making the blood plasma less alkaline
Tap or swipe ↕ to flip
Swipe ←→Navigate
1/20
Key Terms
Term
Definition
What do the released H+ ions do to the blood?
The released hydrogen ions will function to lower the pH of the solution, making the blood plasma less alkaline
What is sensitive to changes in blood pH?
Chemoreceptors are sensitive to changes in blood pH and can trigger body responses in order to maintain a balance
How do the lungs regulate blood pH?
The lungs can regulate the amount of carbon dioxide in the bloodstream by changing the rate of ventilation
How do the kidneys control the blood pH?
The kidneys can control the reabsorption of bicarbonate ions from the filtrate and clear any excess in the urine
What is the range for blood pH?
The pH of blood is required to stay within a very narrow tolerance range (7.35 – 7.45) in order to avoid the onset of disease
What in the blood buffers the pH?
This pH range is, in part, maintained by plasma proteins which act as buffers
Related Flashcard Decks
Study Tips
- Press F to enter focus mode for distraction-free studying
- Review cards regularly to improve retention
- Try to recall the answer before flipping the card
- Share this deck with friends to study together
| Term | Definition |
|---|---|
What do the released H+ ions do to the blood? | The released hydrogen ions will function to lower the pH of the solution, making the blood plasma less alkaline |
What is sensitive to changes in blood pH? | Chemoreceptors are sensitive to changes in blood pH and can trigger body responses in order to maintain a balance |
How do the lungs regulate blood pH? | The lungs can regulate the amount of carbon dioxide in the bloodstream by changing the rate of ventilation |
How do the kidneys control the blood pH? | The kidneys can control the reabsorption of bicarbonate ions from the filtrate and clear any excess in the urine |
What is the range for blood pH? | The pH of blood is required to stay within a very narrow tolerance range (7.35 – 7.45) in order to avoid the onset of disease |
What in the blood buffers the pH? | This pH range is, in part, maintained by plasma proteins which act as buffers |
How does a buffering solution resist changes to pH? | A buffering solution resists changes to pH by removing excess H+ ions (↑ acidity) or OH– ions (↑ alkalinity) |
What molecules can buffer pH? | Amino acids are zwitterions – they may have both a positive and negative charge and hence can buffer changes in pH |
How do amino acids act as buffers? | The amine group may take on H+ ions while the carboxyl group may release H+ ions (which form water with OH– ions) |
What does the oxyhaemoglobin dissociation curve demonstrate? | The oxyhaemoglobin dissociation curve demonstrates the saturation of haemoglobin by oxygen under normal conditions |
Does pH affect the Hb curve? | pH changes alter the affinity of haemoglobin for oxygen and hence alters the uptake and release of O2 by haemoglobin |
How does CO2 affect the pH of the blood? What does this trigger Hb to do? | Carbon dioxide lowers the pH of the blood (by forming carbonic acid), which causes haemoglobin to release its oxygen |
What is the Bohr Effect? | This is known as the Bohr effect – a decrease in pH shifts the oxygen dissociation curve to the right |
What do cells with increased metabolism release? | Cells with increased metabolism (i.e. respiring tissues) release greater amounts of carbon dioxide (product of cell respiration) |
Why is a high CO2 conc. in respiring cells beneficial? | Hence haemoglobin is promoted to release its oxygen at the regions of greatest need (oxygen is an input of cell respiration) |
What receives signals from chemoreceptors to control ventilation? | The respiratory control centre in the medulla oblongata responds to stimuli from chemoreceptors in order to control ventilation |
What is the role of central chemoreceptors? | Central chemoreceptors in the medulla oblongata detect changes in CO2 levels (as changes in pH of cerebrospinal fluid) |
What is the role of peripheral chemoreceptors? | Peripheral chemoreceptors in the carotid and aortic bodies also detect CO2 levels, as well as O2 levels and blood pH |
What increases during exercise? | During exercise metabolism is increased, which results in a build up of carbon dioxide and a reduction in the supply of oxygen |
What does the build-up of CO2 during exercise trigger? | These changes are detected by chemoreceptors and impulses are sent to the respiratory control centre in the brainstem |