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10 Cards in this Set
- Front
- Back
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describe speed of Diffusion of O2 into pulmonary
capillaries |
fast
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Most H+ transported from tissues to lungs is bound to what?
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deoxyHb
which is later conerted to oxyHb. |
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60-70% of CO2 picked up in tissues forms
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h2co3, carbonic acid, which is unstable and turns into bicarbonate hco3 and h+
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what is a major means of regulating body ph
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respiratory system.
if buffers cant keep up, blood ph drops, Small ↑ arterial [H+] → ↑ ventilation thus eliminating co2 and h+ |
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If arterial PO2 ↓ below 60 mmHg
what happens |
respiratory reflexes kick in. this can happen at high altitude.
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How do homeostatic changes in ventilation occur?
2 methods |
Peripheral chemoreceptors in aorta and carotid bodies
• responds to ↓ ↓ PO2/↑ [CO2] Central chemoreceptors in medulla sensitive to changes in PCO2 via [H+] by increasing ventilation |
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three major classes of hormones
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steroids
amines peptides |
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Steroids
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small, lipophilic, made in
gonads, adrenal cortex, placenta, and brain from cholesterol • estrogen, progesterone, testosterone • cortisol and aldosterone |
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Amines
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derived from 1 (or 2) amino
acids • epinephrine from adrenal medulla • thyroid hormones: T3 &T4, tyrosine |
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Peptides
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chains of amino acids
• CRH, ACTH, oxytocin, vasopressin, insulin, glucagon |
