Textbook Question
The kidneys produce _____ urine when the osmolarity of the body's fluids increases. They produce _____ urine when the osmolarity of the body's fluids decreases.
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Ch. 24 The Urinary System
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822
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Table of contents
- Ch. 1 Introduction to Anatomy and Physiology26
- Ch. 2 The Chemistry of Life38
- Ch. 3 The Cell55
- Ch. 4 Histology47
- Ch. 5 The Integumentary System30
- Ch. 6 Bones and Bone Tissue36
- Ch. 7 The Skeletal System40
- Ch. 8 Articulations19
- Ch. 9 The Muscular System36
- Ch. 10 Muscle Tissue and Physiology29
- Ch. 11 Introduction to the Nervous System and Nervous Tissue28
- Ch. 12 The Central Nervous System42
- Ch. 13 The Peripheral Nervous System41
- Ch. 14 The Autonomic Nervous System and Homeostasis31
- Ch. 15 The Special Senses39
- Ch. 16 The Endocrine System42
- Ch. 17 The Cardiovascular System I: The Heart30
- Ch. 18 The Cardiovascular System II: The Blood Vessels43
- Ch. 19 Blood32
- Ch. 20 The Lymphatic System and Immunity45
- Ch. 21 The Respiratory System27
- Ch. 22 The Digestive System27
- Ch. 23 Metabolism and Nutrition7
- Ch. 24 The Urinary System39
- Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis39
- Ch. 26 The Reproductive System10
- Ch. 27 Development and Heredity5
Chapter 24, Problem 16
Net filtration pressure in most capillary beds favors:
a. Absorption
b. Osmosis
c. Filtration
d. Secretion
Verified step by step guidance1
Understand the concept of net filtration pressure (NFP): NFP is the balance of hydrostatic pressure and osmotic pressure across the capillary walls, determining the movement of fluid either into or out of the capillaries.
Identify the forces involved: Hydrostatic pressure pushes fluid out of the capillaries, while osmotic pressure (due to plasma proteins) pulls fluid into the capillaries. These forces oppose each other.
Apply the formula for net filtration pressure: NFP = (Capillary hydrostatic pressure + Interstitial osmotic pressure) - (Capillary osmotic pressure + Interstitial hydrostatic pressure). This formula helps determine whether filtration or absorption occurs.
Determine the typical values in most capillary beds: In most capillary beds, hydrostatic pressure is higher than osmotic pressure, favoring the movement of fluid out of the capillaries, which is known as filtration.
Conclude the physiological process: Based on the balance of pressures, net filtration pressure in most capillary beds favors filtration, as fluid is pushed out of the capillaries into the interstitial space.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Net Filtration Pressure
Net filtration pressure (NFP) is the difference between the hydrostatic pressure and the osmotic pressure within capillaries. It determines the direction and rate of fluid movement across capillary walls. A positive NFP indicates that fluid is likely to leave the capillary (filtration), while a negative NFP suggests fluid is being reabsorbed.
Recommended video:
2:58
Overview of Filtration Pressures
Filtration
Filtration is the process by which fluid and solutes move from the capillaries into the interstitial space due to pressure differences. In the context of capillary beds, filtration occurs when the hydrostatic pressure within the capillaries exceeds the osmotic pressure, leading to the movement of water and small molecules out of the bloodstream.
Recommended video:
4:30The Filtration Membane
Osmosis
Osmosis is the movement of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration. While it plays a crucial role in maintaining fluid balance in the body, in the context of capillary beds, it is primarily the osmotic pressure that counteracts filtration, influencing the reabsorption of fluid back into the capillaries.
Recommended video:
05:59Osmosis
Related Practice
Textbook Question
Normal urine should have which of the following properties? Circle all that apply.
a. Translucency
b. Yellowish pigment
c. Cloudy appearance
d. pH less than 4.5
Textbook Question
Fill in the blanks for each of the following statements:
a. The process by which urine is eliminated is called _____, and it is mediated by reflexes involving the _____ nervous system.
b. The mucosa of the organs of the urinary tract is lined with _____ epithelium.
c. The three layers of smooth muscle in the urinary bladder are known as the _____ muscle.
d. The female urethra provides a passageway for _____, whereas the male urethra provides a passageway for _____ and _____.
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Textbook Question
The GFR may be estimated by measuring the rate at which certain substances are removed from the blood, which is known as:
a. Renal clearance
b. Plasma creatinine
c. Glomerular hydrostatic pressure
d. Inulin estimation