Midterm | Intro + Kidney Flashcards
Other term for the urinary sytem
Excretory system
Main excretory organ of the urinary sytem
Kidney (produces urine)
GENERAL FUNCTIONS OF THE URINARY SYSTEM
FILTRATION
REABSORPTION
SECRETION
EXCRETION
Other terms for excretion of urine
Urination / Voiding / Micturition
MAJOR PARTS OF THE URINARY SYSTEM
R & L KIDNEYS
R & L URETERS
URINARY BLADDER
URETHRA
EXCRETORY ORGANS OF THE BODY AND WHAT THEY EXCRETE
LARGE INTESTINE: Feces
LUNGS: Carbon Dioxide
SKIN: Sweat, oil, wax
KIDNEY: Urine
X-ray image (with contrast) of the urinary bladder and urethra obtained while the patient is voiding/ urinating
voiding cystourethrogram (VCUG)
FUNCTIONS OF THE KIDNEYS
- Regulation of blood ionic composition
- Regulation of blood pH
- Regulation of blood volume
- Regulation of blood pressure
- Maintenance of blood osmolarity
- Production of hormones
- Regulation of blood glucose
- Excretion of wastes and foreign substances
5R(VP PIG) MPE
IONS BEING REGULATED BY THE KIDNEYS
sodium ions
potassium ions
calcium ions
chloride ions
phosphate ions
HOW DOES THE KIDNEYS REGULATE BLOOD VOLUME?
By eliminating the urine
Blood volume and blood pressure relationship
Increased blood volume means an increased blood pressure
HOW DO THE KIDNEYS REGULATE BLOOD PRESSURE?
by secreting the enzyme RENIN
Enzyme secreted by the kidney that is responsible for blood pressure
Renin
Hormone produced by the kidneys and their functions
CALCITRIOL: Form of vitamin D, Helps regulates calcium homeostasis
ERYTHROPOIETIN: Stimulates the production of red blood cells
Substances that have no useful function in the body
WASTES
What urine is made up of
Ammonia (from amino acids)
Urea (from amino acids)
Bilirubin (from liver)
Creatinine (from creatinine phosphates of muscle fibers)
Uric acid (from nucleic acids)
Foreign substances (drugs and environmental toxins)
The kidneys are the same size as
A bar soap
Absence of one kidney (may be genetic)
RENAL AGENESIS/APLASIA
Very uncommon condition when both kidneys fail to develop. It is incompatible with life. infants who have this condition are commonly stillborn or will die 4 hours after birth
BILATERAL AGENESIS/ POTTER SYNDROME
A relatively rare anomaly consisting of the presence of a third, small rudimentary kidney
SUPERNUMERARY KIDNEY
LENGTH OF ADULT KIDNEYS
10-12 cm (4-5 in.)
WIDTH OF ADULT KIDNEYS
5-7 cm (2-3 in.)
THICKNESS OF ADULT KIDNEYS
3 cm (1 in.)
MASS OF ADULT KIDNEYS
135-150 g (4.5-5 oz)
SHAPE OF THE KIDNEYS
BEAN-SHAPED ORGANS
LOCATION OF THE KIDNEYS
Above the waist
Retroperitoneal
Between T12 and L3
R kidney is slightly lower
What partially protects the kidneys?
11th and 12th ribs
This allows the kidneys to lie fairly high in the abdominal cavity
Patient in supine and in expiration
Radiographic correlation: the normal location of kidneys
Lie about halfway between the (1) and the (2)
- xiphoid process
- iliac crest
X-ray performed for the purpose of examining the urinary system and its surrounding
Kidney, ureter, and bladder (KUB)
EXTERNAL ANATOMY OF THE KIDNEYS
RENAL HILUM
RENAL FASCIA
ADIPOSE CAPSULE
RENAL CAPSULE
Indentation near the center of the concave border of the kidney
RENAL HILUM
RENAL HILUM is where the (1) emerges from the kidney along with (2), 3), and (4)
- ureter
- blood vessels
- lymphatic vessels
- nerves
Superficial layer of the kidney
RENAL FASCIA
Thin layer of dense irregular connective tissue that anchors the kidney to the surrounding structures and to the abdominal wall
RENAL FASCIA
Middle layer of the kidneys
ADIPOSE CAPSULE
Mass of fatty tissue surrounding the renal capsule
ADIPOSE CAPSULE
It protects the kidney from trauma and holds it firmly in place within the abdominal cavity
ADIPOSE CAPSULE
Deepest layer of the kidneys
RENAL CAPSULE
The RENAL CAPSULE is continuous up to the —
outer coat of the ureter
Enumerate what makes up:
1. Renal fascia
2. Adipose capsule
3. Renal capsule
- Thin layer of dense irregular connective tissue
- Mass of fatty tissue
- Smooth transparent sheet of irregular connective tissue
Three layers of tissue surround the kidneys
Renal capsule
Adipose capsule
Renal fascia
It serves as a barrier against trauma and helps maintain the shape of the kidney.
Renal capsule
INTERNAL ANATOMY OF THE KIDNEYS
Renal cortex
Renal medulla
Renal pyramids
Renal papillae
Renal columns
Major and minor calyces
Renal pelvis