Author Question: A nurse collects a culture sample of infected tissue. What does the result of testing the culture ... (Read 28 times)

Cooldude101 · **on:** Jul 23, 2018

A nurse collects a culture sample of infected tissue. What does the result of testing the culture contribute to the patient's care?

A) Identifies the specific organism causing the infection
B) Pinpoints the exact site of the infection
C) Identifies individualized patient factors contributing to infection
D) Describes the length of time the patient has experienced infection

Question 2

According to the sliding filament theory, what is the initial action in a muscle contraction?

A) Troponin is freed and prevents actin and myosin from reacting with each other.
B) Calcium binds to troponin, which causes the release of actin and myosin binding sites.
C) Actin and myosin molecules react with each other sliding along the filament and making it shorter.
D) Muscle filament relaxes or slides back to the resting position.

JaynaD87 · **Reply #1 on:** Jul 23, 2018

Answer to Question 1

A
Feedback:
A culture is collected to identify the causative organism of an infection. It can help with determining the site of infection in some cases if the infection is limited only to the site where the culture is collected. It does not individualize patient factors contributing to infection. These must be determined through assessment. It cannot indicate how long the patient has had the infection, which is often determined by the white blood cell count and differential.

Answer to Question 2

C
Feedback:
Actin and myosin molecules react with each other again and again, sliding along the filament and making it shorter. This is a contraction of the muscle fiber according to the sliding filament theory. As the calcium is removed from the cell during repolarization of the muscle membrane, the troponin is freed and once again prevents the actin and myosin from reacting with each other. The muscle filament then relaxes or slides back to the resting position. Muscle tone results from a dynamic balance between excitatory and inhibitory impulses to the muscle.