In Some Cases the Blood in the Urine Is Not

question 17

Multiple Choice

In some cases the blood in the urine is not visible, called ____, and only appears during laboratory testing.

• A) hematuria
• B) calculi
• C) cystitis
• D) occult blood

---

Definitions:

Silicon Tetrahedron

A fundamental structural unit in silicate minerals, consisting of four oxygen atoms symmetrically arranged around a central silicon atom.

Cleavage

The tendency of a mineral to break along flat, smooth surfaces, which is related to the mineral’s crystal structure.

Silicate Minerals

Minerals that contain silicon and oxygen, and usually one or more additional elements, making up the largest and most important class of rock-forming minerals.

Silicon

A chemical element with the symbol Si and atomic number 14, known for its semiconductor properties and widely used in electronics and computer chips.