UH BIOL 1344 - Body Fluids and Water Levels (2 pages)

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Body Fluids and Water Levels

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Body Fluids and Water Levels


lecture notes for remainder of chapter on urinary system. Introduces reproductive system

Lecture number:
Lecture Note
University of Houston
Biol 1344 - Hum Anat Physiol
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BIOL 1344 Lecture 24 Outline of Last Lecture I Transport Maximums and Thresholds of Urine II Blood Flow through Kidneys III Micturition Outline of Current Lecture IV Body Fluids and Water Levels V Acids and Bases in the Body VI Introduction to Male Reproductive System Current Lecture Fluids body is 45 75 water by weight average is 65 Adipose tissue is about 20 skeletal muscles about 75 2 3rds of water weight is intracellular fluid ICF and the other third is extracellular fluid ECF 2 3rds of the ECF is interstitial fluid while the other third is blood plasma Edema is the accumulation of water outside the cells Kwashiorkor is a condition which results in a swollen pot belly due to lack of proteins in the blood creating a hypotonic state This means that water leaves the blood and enters interstitial fluid creating edema Water Intake approximately 700 ml from food 1600 ml from drinking 200 ml produced in the body from metabolic processes more water is created from fats rather than carbohydrates Water Loss approximately 500 ml from sweating 300 ml from breathing vapors 200 ml from feces 1500 ml from feces So the total is about 2500 ml for both intake and loss Over hydration kidneys can make 16 ml urine min maximum So if more water is consumed blood can become diluted osmolarity of plasma can become less than 300 mOsmols causing cellular swelling This is water toxicity and eventually cells can start swimming If brain cells swim the person can go into a coma and even death Dehydration person feels thirst when mOsmols become less than 300 must drink water to balance it out ADH secreted to retain water If there is a lack of ADh this is diabetes insipidus and results in copious diluted urine The person might need more salt in their diet and aldosterone injections If someone is dehydrated to the point of unconsciousness they will These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute need an IV drip of saline solution which is isotonic 300 mOsmols and 8 sodium chlorine solution Acid Base Balance kidneys are the main homeostatic organs to maintain blood pH levels at 7 3 7 4 Acids are lactic acid HCl from the stomach keto acids carbonic acids Buffers for these acids include proteins amino acids bicarbonate which is the most important and phosphates Reproductive System Male no cyclic changes and no adropause sperms produced throughout life External Genital Organs testes scrotal sacs dartos muscle epididymis coiled vas deferens 1821 feet Internal Genital Organs vas deferens 18 inches seminal vesicles produce 60 65 of ejaculate prostate produce 30 35 of ejaculate urethra prostatic membranous and penile urethra cowpers glands bulbourethral glands produce 1 2 drops of clear fluid to neutralize acidity Spermatic fluid 2 5 ml 350 450 million sperms or about 50 150 million per ml If there is less than 40 million ml 50 sterility less than 20 million 100 sterility Azoospermia no viable sperms Testes are 2 3 degrees Celsius below body temperature In about 3 of cases testes are abdominal a condition called cryptorchidism About 3 of testes don t descend into the scrotal sac so they cannot produce viable sperms

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