Respiration Physiology Part 6 Flashcards
(26 cards)
What is the Utilization coefficient of oxygen?
The amount of oxygen released from each 100 mL of blood
flowing through the tissues divided by oxygen capacity.
What is the cardiac output at rest?
5L/min
What is the consumption of oxygen per minute?
250mL
What each 100 ml of blood release while flowing through the tissue?
5mL of O2
What is UCO AT rest?
• the UCO is 25% at rest (250ml/(5L*20ml/100ml)
What is a blue baby?
an infant born with a congenital heart defect. The defect prevents oxygen-rich blood from circulating to the body, which gives the infant’s skin a bluish tint
When does Cyanosis occur?
• when Hb <50g/L
What has extremely high affinity for Hb
And competes for the O2 sites in Hb?
Carbon Monoxide (CO)
What affects the affecting oxygen dissociation curve?
Pso: PO, value when %HbO, is equal to 50%, the value is 26.5
mmHg
What does stge shift to the right of the oxygen dissociation curve mean?
decreased affinity of Hb for oxygen
What decreases the affinity of hemoglobin for oxygen?
- Increased hydrogen ion concentration
- Increased Pco2
- Increased temperature
- Increased DPG (diphosphoglycerate)concentration
What decreases the affinity of hemoglobin for both hydrogen ions and carbon dioxide?
increased Po2 that is ; deoxyhemoglobin has a greater affinity for hydrogen ions and
carbon dioxide than does oxyhemoglobin.
The more active a tissue is, the greater its…..
PCO2, H+concentration, and temperature.
What do you know about regulation of respiration?
• autonomically controlled by the central neuronal network
• can be voluntarily changed
What are the subdivisions of the respiratory center?
• The voluntary system: cerebral cortex (via the corticospinal
tracts) • The automatic (involuntary) system: pons and medulla (via the white matter of the spinal cord )
Whaere is the respiratory center located?
in the central nervous system
Where is the respiratory center distributed?
In the cerebral cortex, diencephalons, pons, medulla
and spinal cord.
What does the respiratory center do?
• Cooperate to produce and control the respiratory rhythm
What is the spinal cord in the respiratory center?
Just a relay station that receives signals from the brain and sends impulses to the respiratory muscles.
It also functions as the elementary center that is involved in some respiratory reflexes.
Basic respiratory rhythm is generated in the?
Medulla
Pneumotaxic center is located at?
High pons(Lower Brain stem)
What can inhibit inspiration and promotes inspiration to
expiration?
Vagi
What are the 2 explanations for respiratory rhythm?
The pacemaker theory
The neuronal network theory
What is the pacemaker theory?
It is believed that the pacemaker-like neurons in the medulla cause respiratory rhythm, just like the pacemakers in the heart.
