Concept explainers
To explain: The way hypophysectomy on an early tadpole will affect the level of thyroxine hormone and metamorphosis.
Introduction: Hormones are chemicals messengers that are produced and circulated in the blood to regulate behavior, physiological, and
Explanation of Solution
A metamorphosis is an important event of tadpole life. Metamorphosis refers to the transformation of an immature form of a tadpole to its adult form. Hypophysectomy in early tadpole will disturb the entire signaling axis, thyroxine would not be secreted and metamorphosis would be blocked.
To explain: The way hypophysectomy on a late tadpole will affect the level of thyroxine hormone and metamorphosis.
Explanation of Solution
The pituitary gland secretes thyroid-stimulating hormone (TSH). TSH signaling is initiated in the early tadpole. This stimulates the thyroxine secretion that binds with the gene for expressing proteins for metamorphosis. If hypophysectomy is performed in late tadpole then it will not affect the metamorphosis or thyroxine level because in late tadpole pituitary hormone is not required.
Want to see more full solutions like this?
Chapter 44 Solutions
1 SEM CARDLESS ACC W/RAVEN TEXT
- Species Interactions Explain how predators, prey and scavengers interact. Explain whether predators and scavengers are necessary or beneficial for an ecosystem.arrow_forwardmagine that you are conducting research on fruit type and seed dispersal. You submitted a paper to a peer-reviewed journal that addresses the factors that impact fruit type and seed dispersal mechanisms in plants of Central America. The editor of the journal communicates that your paper may be published if you make ‘minor revisions’ to the document. Describe two characteristics that you would expect in seeds that are dispersed by the wind. Contrast this with what you would expect for seeds that are gathered, buried or eaten by animals, and explain why they are different. (Editor’s note: Providing this information in your discussion will help readers to consider the significance of the research).arrow_forwardWhat is the difference between Uniporters, Symporters and Antiporters? Which of these are examples of active transport?arrow_forward
- What are Amyloid Fibrils? What biological functions are these known to perform?arrow_forwardHow do histamine and prostaglandins help in the mobilization of leukocytes to an injury site? What are chemotactic factors? How do they affect inflammation process?arrow_forwardCompare and contrast neutrophils and macrophages. Describe two ways they are different and two ways they are similar.arrow_forward
- Describe the effects of three cytokines (not involved in the initial inflammation response). What cells release them?arrow_forwardDescribe activation of helper T cells or cytotoxic T cellsarrow_forwardCompare and contrast MHC 1 and MHC 2. Describe two way they are different and two ways they similar including how they are used in antigen presentation.arrow_forward
- Biology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage LearningBiology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College