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# Tutor profile: Serena S.

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Serena S.
Tutor for 5 years; PhD student at Vanderbilt University
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## Questions

### Subject:Spanish

TutorMe
Question:

Háblame de una vez que tuviste que ayudar a un amigo o una amiga.

Inactive
Serena S.

Una vez, mi amiga trataba de hacer su tarea de matemáticas. Empezó a llorar de frustración. Me di cuenta que ella necesitaba ayuda. Yo la ayudó, y juntas pudimos completar la tarea.

### Subject:Basic Math

TutorMe
Question:

There are 204 students in the lecture hall. They are to split into groups of 10 to 11 students to work on presentations together. How many groups will consist of 10 students and how many groups will consist of 11 students?

Inactive
Serena S.

204/10 = 20 r4 Each of the remaining 4 will be added to one of the groups of 10 students to make groups of 11 students. Therefore, there will be 16 groups of 10 students, and 4 groups of 11 students. To check the math: 16 x 10 = 160 4 x 11 = 44 160 + 44 = 204

### Subject:Biomedical Science

TutorMe
Question:

Aldosterone is an important hormone for homeostasis. What type of hormone is aldosterone, where is it produced, and how is its secretion regulated?

Inactive
Serena S.

Aldosterone is a mineralocorticoid, which is a type of steroid hormone. Under normal circumstances, it is produced in the zona glomerulosa of the adrenal gland. Its secretion is regulated by the renin-angiotensin pathway; therefore, osmolarity of blood and blood pressure are important in regulation. Specifically, decreased blood pressure and/or sodium ion concentration stimulates renin secretion into the bloodstream, which converts angiotensinogen to angiotensin I. ACE enzyme then converts angiotensin to angiotensin II, which stimulates adrenal cortical cells to secrete aldosterone for conservation of sodium ions and water. Return to normal blood pressure through this process inhibits further secretion of renin and further inhibits downstream effects described.

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