LIFE:SCIENCE OF BIOL.(LL) >CUSTOM<
LIFE:SCIENCE OF BIOL.(LL) >CUSTOM<
11th Edition
ISBN: 9781319209957
Author: Sadava
Publisher: MAC HIGHER
bartleby

Videos

Question
Book Icon
Chapter 40, Problem 2Q
Summary Introduction

To review:

The hypothesis that have led to the results in table by the production of epinephrine.

Given:

Cataract in humans is a fatal disease that leads to loss of vision. It is caused by excessive exposure to ultraviolet light and also due to the age factor. There is cloudy appearance and non-transparency of the lens. The cataract has to be removed by the surgeon for the recovery of sight. For surgery, the surgeon makes sure that pupil is dilated properly and for a longer time. The dilation of the pupil is controlled by adrenal medulla which releases epinephrine and norepinephrine.

An experiment was conducted by the researchers to find if epinephrine can help in keeping the pupil dilated for a longer time during cataract surgeries. Epinephrine was injected into the eye of the 27 patients who came for cataract surgery but not injected in the eyes of other 43 other patients.

The following table depicts the percentage of patients whose eyes had the pupil diameter size less than five mm during the different stages of the cataract surgery.

LIFE:SCIENCE OF BIOL.(LL) >CUSTOM<, Chapter 40, Problem 2Q

The percentage of individuals having the diameter of pupil less than five mm

Introduction:

Pupil is a small opening in the iris which is surrounded by two types of smooth muscles. Light is perceived by the pupil and reaches the retina of the eye for image formation. Epinephrine is a fight fright and flight hormone which has the direct control over the contraction and relaxation of the pupil. The dilation of pupil by epinephrine increases its size while contraction reduces the size.

Blurred answer
Students have asked these similar questions
You aim to test the hypothesis that the Tbx4 and Tbx5 genes inhibit each other's expression during limb development. With access to chicken embryos and viruses capable of overexpressing Tbx4 and Tbx5, describe an experiment to investigate whether these genes suppress each other's expression in the limb buds. What results would you expect if they do repress each other? What results would you expect if they do not repress each other?
You decide to delete Fgf4 and Fgf8 specifically in the limb bud. Explain why you would not knock out these genes in the entire embryo instead.
You implant an FGF10-coated bead into the anterior flank of a chicken embryo, directly below the level of the wing bud. What is the phenotype of the resulting ectopic limb?  Briefly describe the expected expression domains of 1) Shh, 2) Tbx4, and 3) Tbx5 in the resulting ectopic limb bud.
Knowledge Booster
Background pattern image
Biology
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
Human Physiology: From Cells to Systems (MindTap ...
Biology
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Cengage Learning
Text book image
Biomedical Instrumentation Systems
Chemistry
ISBN:9781133478294
Author:Chatterjee
Publisher:Cengage
Text book image
Principles Of Radiographic Imaging: An Art And A ...
Health & Nutrition
ISBN:9781337711067
Author:Richard R. Carlton, Arlene M. Adler, Vesna Balac
Publisher:Cengage Learning
Text book image
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Biology
ISBN:9781305967359
Author:STARR
Publisher:CENGAGE L
Text book image
Essentials Of Human Development
Biology
ISBN:9781285647357
Author:Kail
Publisher:Cengage
Text book image
Biology (MindTap Course List)
Biology
ISBN:9781337392938
Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher:Cengage Learning
Complications during Labour and Delivery; Author: FirstCry Parenting;https://www.youtube.com/watch?v=QnCviG4GpYg;License: Standard YouTube License, CC-BY