Answer: B. Sarcoplasmic reticulum
Explanation: The sarcoplasmic reticulum is the name given to the organelle in the muscle cell, in charge of the storage and regulation of the intracellular calcium levels. It is the smooth endoplasmic reticulum in muscle cells, it means that it does not have ribosomes in its surface.
Option A. Incorrect. A SARCOMERE is the functional and anatomic unit of the striated muscle (skeletal muscle and heart muscle). This word comes from the greek: <em>sarkos (meat), meros (part). </em>That is reason you could find other structures of the muscle cell with this root (SARCO...).
Option C. Incorrect. "Arcolemma" this word does not exist. But if it refers to SARCOLEMMA, this word means: <em>sarko (meat), lema (cortex) </em>in greek<em>. </em>It is the plasma membrane of the muscle cells.
Option D. Incorrect. The SARCOPLASM, comes from the greek: <em>sarko (meat), plasm (matter). </em>This structure is the citoplasm of the muscle cells.
In conclusion, the word SARCOPLASMIC RETICULUM, refers to a <em>structure of the muscle cell, </em>that in this case, is the RETICULUM or the SMOOTH ER.
Answer:
The mental health professional tells him he does't meat the criteria for general anxiety disorder, because of the number and lenght of his worries.
Explanation:
The mental health professional tells him he doesn't have an anxiety disorder, so his grade problems are not explained by this disorder. This doesn't mean he cannot benefit from talking to a psychology about his problems.
Answer:
The <u>Orbicularis oris</u><u> </u>causes the lips to close and pucker during kissing, whistling and speaking.
Explanation:
<u>Orbicularis oris muscles are facial muscles which are located in the thickness of lip around oral opening. </u>
The muscle consists of two main parts
(a) Marginal part consisting of the longitudinal fibers -Closes the oral opening.
(b)Labial part consisting of the circular fibers - pushes the lips forward.
The main function of the orbicularis oris is closing of the mouth. It puckers the lips when it contracts.
These muscles are used to do actions like kissing, whistling and speaking.
Thus,
The <u>Orbicularis oris </u>causes the lips to close and pucker during kissing, whistling and speaking.