Textbook Question
At the end of meiosis, each cell has ________ chromosomes and they are genetically ________ from the original cell.
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Ch. 26 The Reproductive 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 26, Problem L2.2
Sustentacular cells in the testes are nicknamed 'nurse cells.' Explain why the nickname is appropriate.
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Understand the role of sustentacular cells (also known as Sertoli cells) in the testes. These cells are located within the seminiferous tubules and play a critical role in supporting and regulating spermatogenesis, the process of sperm production.
Learn about the structural function of sustentacular cells. They form the blood-testis barrier, which protects developing sperm cells from harmful substances and immune system attacks, ensuring a safe environment for sperm maturation.
Explore the nutritional support provided by sustentacular cells. They supply nutrients and growth factors to the developing sperm cells, which is essential for their survival and proper development.
Examine the regulatory role of sustentacular cells. They secrete hormones such as inhibin, which helps regulate the production of sperm by providing feedback to the hypothalamus and pituitary gland to control follicle-stimulating hormone (FSH) levels.
Understand why the nickname 'nurse cells' is appropriate. Sustentacular cells perform nurturing and protective functions similar to a nurse, ensuring the proper development, maturation, and regulation of sperm cells within the testes.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Sustentacular Cells
Sustentacular cells, also known as Sertoli cells, are found in the seminiferous tubules of the testes. They play a crucial role in supporting and nurturing developing sperm cells during spermatogenesis. These cells provide structural support, regulate the environment, and supply nutrients necessary for sperm maturation.
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Cell Junctions
Nourishment and Support
The nickname 'nurse cells' reflects the primary function of sustentacular cells in providing nourishment and support to germ cells. They create a conducive environment for sperm development by secreting substances that promote cell growth and differentiation, similar to how a nurse cares for patients.
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3:43Support Structures
Blood-Testis Barrier
Sustentacular cells form the blood-testis barrier, a specialized structure that protects developing sperm from harmful substances in the bloodstream. This barrier also helps maintain a unique microenvironment essential for spermatogenesis, further emphasizing the protective and nurturing role of these cells, akin to a nurse safeguarding their patients.
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1:09Chemical Barriers
Related Practice
Textbook Question
Match the specific phase of meiosis with the correct description.
________Prophase I
________Metaphase I
________Anaphase I
________ Telophase I
________Prophase II
________Metaphase II
________Anaphase II
________ Telophase II
a. Homologous chromosomes arrive at opposite poles.
b. Homologous chromosomes line up.
c. Chromosomes line up at the equator.
d. Independent assortment occurs.
e. Separated sister chromatids arrive at opposite poles.
f. Sister chromatids remain condensed.
g. Crossing over occurs.
h. Sister chromatids pull apart.
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Textbook Question
Mr. Hassan has recently started getting up during the night to urinate and has also noticed that he is having trouble emptying his bladder. He has made a doctor's appointment, but his wife has already told him that the doctor will want to check his prostate. Do you think his wife is correct? Explain your answer.
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Textbook Question
The second meiotic division is very similar to mitosis. How would you explain the differences between the first meiotic division and mitosis?
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Textbook Question
Which of the following areas in the female reproductive tract is the site of fertilization?
a. Uterus
b. Ampulla of the uterine tube
c. Vagina
d. Cervix of the uterus
e. Any of these areas are possible sites of fertilization