The First Heart Sound Is Caused by the Closing of the _____

question 8

Multiple Choice

The first heart sound is caused by the closing of the _____ valve(s) .

• A) mitral
• B) semilunar
• C) tricuspid
• D) both A and C

---

Definitions:

Resource Allocation

The process of distributing available resources among various competing needs or uses in an effort to achieve maximum efficiency or to accomplish specific objectives.

Excise Tax

An indirect tax charged on the sale of a particular good or service, often included in the price of products like gasoline, alcohol, and tobacco.

Marginal Cost (MC) Curves

Graphs showing the cost of producing one additional unit of a good, illustrating how the cost varies with the level of output.