Get premium membership and access questions with answers, video lessons as well as revision papers.
breathing movements usually occur unconsciously
it is controlled by the medulla oblongata part of the brain situated at the breathing centre
medullar oblongata is in the brain
respiratory centre transmits impulses to the diaphragm through phrenic nerves
carbon iv oxide concentration in the blood determines the breathing rate
if carbon iv oxide is less, the brain is triggered to decrease breathing rate
cardiac frequency decreases and the arterioles constrict
therefore carbon iv oxide level is raised
this brings back to normal level of breathing and carbon iv oxide level increases/is more
the brain is triggered to increase breathing rate
cardiac frequency is increased
there is vasodilation of arterioles
carbon iv oxide level falls
therefore the normal level is attained and carbon iv oxide is removed faster
Mohaissack answered the question on October 5, 2017 at 12:18
- Explain the physiological changes that occur in the body to lower the carbon iv oxide level back to normal when it rises(Solved)
Explain the physiological changes that occur in the body to lower the carbon iv oxide level back to normal when it rises
Date posted: October 5, 2017. Answers (1)
- Give the conditions under which the carbon iv oxide level rises above normal in mammalian blood(Solved)
Give the conditions under which the carbon iv oxide level rises above normal in mammalian blood
Date posted: October 5, 2017. Answers (1)
- State the advantages of breathing through the nose rather than through the mouth(Solved)
State the advantages of breathing through the nose rather than through the mouth
Date posted: October 5, 2017. Answers (1)
- How is the trachea of a mammal suited to its function?(Solved)
How is the trachea of a mammal suited to its function?
Date posted: October 5, 2017. Answers (1)
- Name the features of alveoli that adapt them to their function(Solved)
Name the features of alveoli that adapt them to their function
Date posted: October 5, 2017. Answers (1)
- Explain how mammalian lungs are adapted to gaseous exchange(Solved)
Explain how mammalian lungs are adapted to their functions
Date posted: October 5, 2017. Answers (1)
- State how tracheoles are adapted to gaseous exchange(Solved)
State how tracheoles are adapted to gaseous exchange
Date posted: October 5, 2017. Answers (1)
- Describe the mechanism of gaseous exchange in terrestrial insects(Solved)
Describe the mechanism of gaseous exchange in terrestrial insects
Date posted: October 5, 2017. Answers (1)
- What is the advantage of counter-flow system?(Solved)
What is the advantage of counter-flow system?
Date posted: October 5, 2017. Answers (1)
- What is counter-flow system?(Solved)
What is counter-flow system?
Date posted: October 5, 2017. Answers (1)
- Discuss gaseous exchange in bony fish(Solved)
Discuss gaseous exchange in bony fish
Date posted: October 5, 2017. Answers (1)
- How is a fish gill adapted to its function?(Solved)
How is a fish gill adapted to its function?
Date posted: October 5, 2017. Answers (1)
- Describe gaseous exchange in protozoa(Solved)
Describe gaseous exchange in protozoa
Date posted: October 5, 2017. Answers (1)
- State and explain the characteristics of respiratory surfaces in animals(Solved)
State the characteristics of respiratory surfaces in animals
Date posted: October 5, 2017. Answers (1)
- List the types of respiratory surfaces of animals(Solved)
List the types of respiratory surfaces of animals
Date posted: October 5, 2017. Answers (1)
- Explain stomatal distribution in plants of different habitats(Solved)
Explain stomatal distribution in plants of different habitats
Date posted: October 5, 2017. Answers (1)
- State the ways in which floating leaves of aquatic plants are adapted to gaseous exchange(Solved)
State the ways in which floating leaves of aquatic plants are adapted to gaseous exchange
Date posted: October 5, 2017. Answers (1)
- Describe how gaseous exchange takes place in terrestrial plants(Solved)
Describe the process of gaseous exchange in terrestrial plants.
Date posted: October 5, 2017. Answers (1)
- State the ways in which leaves of plants are adapted to gaseous exchange(Solved)
State the ways in which leaves of plants are adapted to gaseous exchange
Date posted: October 5, 2017. Answers (1)
- What is the advantage of having stomata open during daytime and having them closed at night?(Solved)
What is the advantage of having stomata open during daytime and having them closed at night?
Date posted: October 5, 2017. Answers (1)