
Concept explainers
Introduction:
The lymphatic system is the drainage system of the body that picks up the lymph (excess interstitial fluid) and returns it to the blood. The lymph capillaries absorb the excess and leaked fluid and weave between the blood capillaries as well as the tissue cells.

Answer to Problem 1MC
Correct answer:
The lymph capillaries contain endothelial cells, which are separated via flap like valves that can open wide.
Explanation of Solution
Explanation for the correct answer:
Option (c) is given that lymph capillaries possess endothelial cells separated by flap like valves that can open wide. The lymph capillaries contain the flap like mini valves, which act as the one-way swinging door. The endothelial cells that form the walls overlap one another loosely thus, forming the valve. Hence, option (c) is correct.
Explanation for incorrect answers:
Option (a) is given that lymph capillaries are open-ended same as the drinking straws. The lymph capillaries are not open at one end; instead, they are separated by the flap-like minivalves, which act as one way swinging door. So, it is an incorrect option.
Option (b) is given that lymph capillaries have continuous tight junctions like the capillaries present in the brain. The lymph capillaries possess flap like minivalves and not the tight junctions. So, it is an incorrect option.
Option (d) is given that lymph capillaries contain special barriers that stop cancer cells from entering. The bacteria and the cancer cells can enter the lymph capillaries as they do not contain special barriers to prevent their passage. So, it is an incorrect option.
Hence, options (a), (b), and (d) are incorrect.
The lymph capillaries contain endothelial cells that form their wall. The endothelial cells overlap at the edges and form flap like mini valves that functions as one-way door.
Want to see more full solutions like this?
Chapter 12 Solutions
Essentials of Human Anatomy & Physiology Plus MasteringA&P with eText -- Access Card Package (11th Edition)
- Please identify the curve shown below. What does this curve represent? Please identify A, B, C, D, and E (the orange oval). What is occurring in these regions?arrow_forwardPlease identify the test shown here. 1) What is the test? 2) What does the test indicate? How is it performed? What is CX? 3) Why might the test be performed in a clinical setting? GEN CZ CX CPZ PTZ CACarrow_forwardDetermine how much ATP would a cell produce when using fermentation of a 50 mM glucose solution?arrow_forward
- Determine how much ATP would a cell produce when using aerobic respiration of a 7 mM glucose solution?arrow_forwardDetermine how much ATP would a cell produce when using aerobic respiration to degrade one small protein molecule into 12 molecules of malic acid, how many ATP would that cell make? Malic acid is an intermediate in the Krebs cycle. Assume there is no other carbon source and no acetyl-CoA.arrow_forwardIdentify each of the major endocrine glandsarrow_forward
- Come up with a few questions and answers for umbrella species, keystone species, redunant species, and aquatic keystone speciesarrow_forward19. On the diagram below a. Label the three pictures as: DNA; polypeptide; or RNA. b. Label the arrows as: translation or transcription/RNA processing. c. Add the following details to the diagram. Promoter region TATA box Transcription start site Transcription terminator Intron (A,B,C,D) Exons (1,2,3,4,5) Splice sites 5' cap 5' UTR (untranslated region) 3' poly A tail 3' UTR (untranslated region) Translational start (AUG) Translational stop (UGA, UAG, or UAA) N and C ends of polypeptide 0000arrow_forwardMatch the letter labels in the figure below to the terms. Some letter labels are not used. MNNNNNNIN M C B A M D F E H K G 8arrow_forward
- Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning
- Human Biology (MindTap Course List)BiologyISBN:9781305112100Author:Cecie Starr, Beverly McMillanPublisher:Cengage LearningMedical Terminology for Health Professions, Spira...Health & NutritionISBN:9781305634350Author:Ann Ehrlich, Carol L. Schroeder, Laura Ehrlich, Katrina A. SchroederPublisher:Cengage Learning



