During intense physical exercise, human cells and tissues increase their need for oxygen to provide the ATP necessary for work. Why does heart rate have to increase to meet the need for oxygen?
What will be an ideal response?
The respiratory system depends on the circulatory system for transport and dealing with the carbon dioxide produced as a waste product of cellular respiration. Oxygen is efficiently moved to target tissues through the blood by binding to hemoglobin in red blood cells. The number of red blood cells present is the limiting feature in how much oxygen can be transported in a given period of time. The faster blood is circulated (within limits) through the body, the more oxygen that can be transported and hence the more efficient the exercise can be performed or the longer one can engage in the activity.
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Desmosomes are a type of ____
a. anchoring junction b. cell adhesion molecule c. tight junction d. intermediate filament e. gap junction
When the coronary arteries become narrowed and blood flow to the heart is reduced, a person may experience cramping chest pain upon exertion, prior to a heart attack or death of cardiac muscle tissue. This condition is called ________.
Fill in the blank(s) with the appropriate word(s).
Now that small molecular-level deletions and subtle chromosomal rearrangements can be discovered using advanced cytogenetic techniques and microarrays, disorders whose causes had not previously been known can have their basis identified
However, since most of these are not widely publicized, being individually rare, it has been difficult to identify patients with shared chromosomal abnormalities who share phenotypic features. A new database, known as DECIPHER, is now available to search for patients with like phenotypes and/or like chromosomal abnormalities. If you are the clinical geneticist who has a patient whose data is entered into this database, suggest three or more ways using this database can benefit your patient or your field in general.
Which of the following is a microbial product used to reduce crop damage?
A) Bt toxin B) saxitoxin C) ice-minus D) both Bt toxin and ice-minus E) both Bt toxin and saxitoxin