A placebo experiment is one that does no harm or good. A lot of the time researchers will have a. placebo group and a another control group with the actual treatment. The key in placebo is that no one knows if they have it or not. C
<em><u>Answer:</u></em>
<em><u>Answer:The ventricles of the heart have thicker muscular walls than the atria. This is because blood is pumped out of the heart at greater pressure from these chambers compared to the atria. The left ventricle also has a thicker muscular wall than the right ventricle, as seen in the adjacent image</u></em>.
Answer:
Most likely he has injured his <u>Calcaneal tendon</u> and the bulge is <u>triceps surae or calf muscle.</u>
Explanation:
The calcaneal tendon is the thickest tendon, which is present at the back of the lower leg and begins at the middle of the calf. It is covered with skin and fascia and connects the bones with the muscles.
The calf muscles or the triceps surae, are the muscles present in the calf of the leg.The calf muscles act via the tendon and cause flexion of the knee and the ankle.
<u>While exercising, an overuse of the calcaneal tendon, can result in pulling of the calf muscles from the Achilles tendon. Thus causing a tear in the calf muscle, which appears like a bulge.</u>
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.