Respiratory Response To Exercise Flashcards
Mechanics of breathing (INHALATION)
External intercostal muscles contract, expanding rib cage up and out.
Diaphragm contracts,pulling downwards to ⬆️ volume of chest
Pressure inside chest ⬇️ and air is sucked in to lungs.
Mechanics of breathing (EXHALATION)
Internal intercostal relax, rib cage drops down and in.
Diaphragm relaxes, moving back upwards, decreasing volume of chest.
Pressure inside the chest increased and air is forced out.
Mechanics of breathing durning exercise (INHALATION)
Greater volumes of air can fill the lungs as the sternocleidomastoid and pectoralis minor muscles help move the ribs and increase chest cavity further.
Mechanics of breathing at exercise (EXHALATION)
Internal intercostal muscles and abdominal muscles help to pull ribs downwards.
Neural regulation of breathing what receptors used
Chemoreceptors
Stretch receptors
Proprioceptors
Baroreceptors
Chemoreceptors in breathing
At exercise CO2 builds up in blood and RCC is stimulated by chemoreceptors to ⬆️respiratory rate.
The inspiratory centre in the RCC sends out nerve impulses via the phrenic nerve to diaphragm and external intercostal muscles causing then to contract.
Stretch receptors in breathing
Stretch receptors in the walls of bronchi prevent over inflation of lungs. Sends impulses to the expiratory centre and down the intercostal nerve to the abdominals and internal intercostals.
Proprioceptors in breathing
In the joints and muscles detect an increase in muscle movement and stimulate RCC to ⬆️breathing rate.
Baroreceptors in breathing
In carotid arteries and aorta detect a decrease in blood pressure and stimulate the RCC to increase breathing rate.
Hormonal control of breathing
Adrenaline is released into blood as exercise starts.
As a result breathing ⬆️ to deliver more o2 to working muscles and to remove CO2.
