Videos
In humans, sperm are produced in the
- a. spermatophore.
- b. seminiferous tubules.
- c. epididymis.
- d. urethra.
Introduction:
The male reproductive system consists of the testes which produce sex hormones and sperm; glands that secrete the substances which nourish and activate the sperm, and tubes that collect the sperm and conduct them out of the body. The sex hormone such as testosterone and sperm are produced at the beginning of the puberty.
Answer to Problem 1MC
Correct answer:
In humans, sperms are produced in the seminiferous tubules. Therefore, option (b) is correct.
Option (b) is given as “seminiferous tubules”.
Explanation of Solution
Justify reason for the correct statement:
Sperms are produced in the testes, and each testes is filled with the coiled structure, called the seminiferous tubules in which sperm are produced. The inner lining of the seminiferous tubules contains two types of cells, the stem cells called the spermatogonial stem cells, which produce sperm, and the Sertoli cells which nourish the developing sperm.
Hence, option (b) is correct.
Justify reasons for the incorrect statements:
Option (a) is given as “spermatophore”.
Spermatophore is a protein capsule which contains a mass of spermatozoa. So, sperm is not produced in the spermatophore. Hence, it is a wrong answer.
Option (c) is given as “epididymis”.
Epididymis is a long folded tube-like structure in which sperm are stored and mature further. Hence, it is a wrong answer.
Option (d) is given as “urethra”.
The urethra conducts urine and sperm out of the body during urination and ejaculation respectively. Hence, it is a wrong answer.
Hence, options (a), (c), and (d). are incorrect.
Hence, sperms are produced in the seminiferous tubules. The inside wall of the seminiferous tubules contains the stem cells called the spermatogonial stem cells, which produce sperm.
Want to see more full solutions like this?
Chapter 42 Solutions
Pearson eText Biology: Life on Earth with Physiology -- Instant Access (Pearson+)
Additional Science Textbook Solutions
Campbell Essential Biology (7th Edition)
Introductory Chemistry (6th Edition)
Chemistry & Chemical Reactivity
Genetics: From Genes to Genomes
Microbiology Fundamentals: A Clinical Approach
- 10. Your instructor will give you 2 amino acids during the activity session (video 2-7. A. First color all the polar and non-polar covalent bonds in the R groups of your 2 amino acids using the same colors as in #7. Do not color the bonds in the backbone of each amino acid. B. Next, color where all the hydrogen bonds, hydrophobic interactions and ionic bonds could occur in the R group of each amino acid. Use the same colors as in #7. Do not color the bonds in the backbone of each amino acid. C. Position the two amino acids on the page below in an orientation where the two R groups could bond together. Once you are satisfied, staple or tape the amino acids in place and label the bond that you formed between the two R groups. - Polar covalent Bond - Red - Non polar Covalent boND- yellow - Ionic BonD - PINK Hydrogen Bonn - Purple Hydrophobic interaction-green O=C-N H I. H HO H =O CH2 C-C-N HICK H HO H CH2 OH H₂N C = Oarrow_forwardFind the dental formula and enter it in the following format: I3/3 C1/1 P4/4 M2/3 = 42 (this is not the correct number, just the correct format) Please be aware: the upper jaw is intact (all teeth are present). The bottom jaw/mandible is not intact. The front teeth should include 6 total rectangular teeth (3 on each side) and 2 total large triangular teeth (1 on each side).arrow_forward12. Calculate the area of a circle which has a radius of 1200 μm. Give your answer in mm² in scientific notation with the correct number of significant figures.arrow_forward
- Describe the image quality of the B.megaterium at 1000X before adding oil? What does adding oil do to the quality of the image?arrow_forwardWhich of the follwowing cells from this lab do you expect to have a nucleus and why or why not? Ceratium, Bacillus megaterium and Cheek epithelial cells?arrow_forward14. If you determine there to be debris on your ocular lens, explain what is the best way to clean it off without damaging the lens?arrow_forward
- 11. Write a simple formula for converting mm to μm when the number of mm's is known. Use the variable X to represent the number of mm's in your formula.arrow_forward13. When a smear containing cells is dried, the cells shrink due to the loss of water. What technique could you use to visualize and measure living cells without heat-fixing them? Hint: you did this technique in part I.arrow_forward10. Write a simple formula for converting μm to mm when the number of μm's are known. Use the variable X to represent the number of um's in your formula.arrow_forward
- 8. How many μm² is in one cm²; express the result in scientific notation. Show your calculations. 1 cm = 10 mm; 1 mm = 1000 μmarrow_forwardFind the dental formula and enter it in the following format: I3/3 C1/1 P4/4 M2/3 = 42 (this is not the correct number, just the correct format) Please be aware: the upper jaw is intact (all teeth are present). The bottom jaw/mandible is not intact. The front teeth should include 6 total rectangular teeth (3 on each side) and 2 total large triangular teeth (1 on each side).arrow_forwardAnswer iarrow_forward
Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College
Human Biology (MindTap Course List)BiologyISBN:9781305112100Author:Cecie Starr, Beverly McMillanPublisher:Cengage Learning
Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning
Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage Learning