Textbook Question
More than one choice may apply.
What is the glomerulus?
a. The same as the renal tubule
b. The same as Bowman's capsule
c. The same as the nephron
d. Capillaries
950
views
Ch. 15 The Urinary System
Marieb13th EditionEssentials of Human Anatomy & PhysiologyISBN: 9780135624340
Not the one you use?Change textbookSelect a different textbook
Table of contents
- Ch. 1 The Human Body: An Orientation23
- Ch. 2 Basic Chemistry22
- Ch. 3 Cells and Tissues20
- Ch. 4 Skin and Body Membranes13
- Ch. 5 The Skeletal System38
- Ch. 6 The Muscular System26
- Ch. 7 The Nervous System26
- Ch. 8 Special Senses12
- Ch. 9 The Endocrine System24
- Ch. 10 Blood22
- Ch. 11 Cardiovascular System29
- Ch. 12 The Lymphatic System and Body Defenses21
- Ch. 13 The Respiratory System7
- Ch. 14 The Digestive System and Body Metabolism13
- Ch. 15 The Urinary System23
- Ch. 16 The Reproductive System15
Marieb13th EditionEssentials of Human Anatomy & PhysiologyISBN: 9780135624340Not the one you use?Change textbook
Chapter 15, Problem 5
More than one choice may apply.
Which of the following is dependent on tubular secretion?
a. Clearing penicillin from the blood
b. Removal of nitrogenous wastes that have been reabsorbed
c. Removal of excess potassium ions from the blood
d. Control of blood pH
Verified step by step guidance1
Understand the concept of tubular secretion: Tubular secretion is the process by which substances are actively transported from the blood in the peritubular capillaries into the renal tubules. This mechanism helps remove waste products, regulate ion concentrations, and maintain acid-base balance.
Analyze option (a): Clearing penicillin from the blood involves tubular secretion because penicillin is actively secreted into the renal tubules for excretion. This process bypasses filtration and relies on active transport mechanisms.
Analyze option (b): Removal of nitrogenous wastes that have been reabsorbed can involve tubular secretion. For example, urea and other nitrogenous wastes may be secreted back into the tubules after being reabsorbed in earlier stages of filtration.
Analyze option (c): Removal of excess potassium ions from the blood is dependent on tubular secretion. Potassium ions are actively secreted into the distal tubules and collecting ducts to regulate electrolyte balance.
Analyze option (d): Control of blood pH is dependent on tubular secretion. Hydrogen ions (H⁺) and bicarbonate ions (HCO₃⁻) are secreted or reabsorbed in the renal tubules to maintain acid-base balance in the blood.
Verified video answer for a similar problem:
This video solution was recommended by our tutors as helpful for the problem above.
Video duration:
3mWas this helpful?
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Tubular Secretion
Tubular secretion is a process in the kidneys where substances are actively transported from the blood into the renal tubules. This mechanism is crucial for eliminating waste products, regulating electrolyte balance, and maintaining acid-base homeostasis. It allows the body to excrete substances like drugs and excess ions that are not filtered by the glomerulus.
Recommended video:
01:33
Protein Secretion
Renal Clearance
Renal clearance refers to the volume of plasma from which a substance is completely removed by the kidneys per unit time. It is an important measure for understanding how effectively the kidneys are functioning, particularly in the context of drugs like penicillin, which are cleared from the bloodstream through both filtration and secretion processes.
Recommended video:
4:58Overview of Renal Physiology
Acid-Base Balance
Acid-base balance is the regulation of the pH levels in the body fluids, primarily managed by the kidneys and lungs. The kidneys contribute by secreting hydrogen ions and reabsorbing bicarbonate, which helps control blood pH. This balance is vital for normal cellular function and overall metabolic processes.
Recommended video:
01:29Acids and Bases
Related Practice
Textbook Question
Describe the location of the kidneys in the body.
1725
views
Textbook Question
More than one choice may apply.
Urine passes through the ureters by which mechanism?
a. Ciliary action
b. Gravity alone
c. Peristalsis
d. Suction
1133
views
Textbook Question
Trace the pathway a uric acid molecule takes from a glomerulus to the urethra. Name every gross or microscopic structure it passes through on its journey.
991
views
Textbook Question
Using the image provided, identify and label the cortex, medulla, medullary pyramids, renal columns, and pelvis.
<IMAGE>
1195
views
1
rank
Textbook Question
More than one choice may apply.
Match each letter from the figure with the correct blood vessel name.
Interlobar vein
935
views