4328070
Description
Mind Map by Antonia Smith, updated more than 1 year ago
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Created by Antonia Smith
almost 9 years ago
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Renal system (2)
- Explain net filtration pressure
- Blood hydrostatic pressure entering the renal corpuscle is
55mmHg, an appropriate pressure for filtration, but it is conflicted
by other pressures. The pressure of the glomerular capsule against
the capillary is 15mmHg, and the blood colloid osmotic pressure
created by proteins in the blood drawing some filtrate back
through the fenestrations is 30mmHg. This leaves the net filtration
pressure at 10mmHg, which is sufficient, but is part of why it is
important that the kidneys help keep blood pressure regulated.
- Blood hydrostatic pressure entering the renal corpuscle is
55mmHg, an appropriate pressure for filtration, but it is conflicted
by other pressures. The pressure of the glomerular capsule against
the capillary is 15mmHg, and the blood colloid osmotic pressure
created by proteins in the blood drawing some filtrate back
through the fenestrations is 30mmHg. This leaves the net filtration
pressure at 10mmHg, which is sufficient, but is part of why it is
important that the kidneys help keep blood pressure regulated.
- Explain the function of the kidney in
maintaining blood pressure
- Low BP - Renin released from kidney
- Renin converts angiotensinogen in blood to
angiotensin - causes vasoconstriction
- Angiotensin triggers aldosterone release from adrenal gland
- Aldosterone causes increased Na+ reabsorption
- Higher Na+ (osmolality) causes increased water reabsorption
- = Higher blood volume, regulated BP
- = Higher blood volume, regulated BP
- Higher Na+ (osmolality) causes increased water reabsorption
- Aldosterone causes increased Na+ reabsorption
- Vasoconstriction = increased BP
- Angiotensin triggers aldosterone release from adrenal gland
- Renin converts angiotensinogen in blood to
angiotensin - causes vasoconstriction
- Low BP - Renin released from kidney
- Explain the micturition (expulsion of urine) reflex
- Involuntary reflex i.e. babies pee when urge arises
- Ability to decide to override reflex is learnt
- Bladder fills
- Stretch receptors are fired
- Made aware of need to urinate
- Internal involuntary sphincter relaxes
- For urination, the external voluntary sphincter must relax
- If not ok to urinate, internal involuntary
sphincter contracts & bladder relaxes
- However, stimulus (urine) still present, so stretch
receptors will fire again until micturition is
possible (if ability to decide is developed)
- However, stimulus (urine) still present, so stretch
receptors will fire again until micturition is
possible (if ability to decide is developed)
- If not ok to urinate, internal involuntary
sphincter contracts & bladder relaxes
- For urination, the external voluntary sphincter must relax
- Internal involuntary sphincter relaxes
- Made aware of need to urinate
- Stretch receptors are fired
- Involuntary reflex i.e. babies pee when urge arises
- Describe effects of aging on
the urinary system
- Nephrons reduced to 1/3 of original amount
with old age so are not as efficient
- Nephrons reduced to 1/3 of original amount
with old age so are not as efficient
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