Answer:
At first, a fetus cannot distinguish between different voices.
A fetus begins responding to sound at between 22 and 24 weeks but can only hear low frequencies, such as a dog barking or a lawn mower.
As the auditory system and the brain continue to develop, this range increases. By late pregnancy, the fetus can hear voices and distinguish between
so at 22 weeks they're in the middle of the second trimester and can hear sounds but in the 3rd trimester can distinguish between voices
Endoscopes can be passed into the large intestine (colon) through the rectum to examine this area of the intestine. This procedure is called sigmoidoscopy or colonoscopy depending on how far up the colon is examined.
Answer:
An increased body temperature made changes to the T-cell membrane to fight certain temperature sensitive viruses or bacteria.
Explanation:
According to medical science, having fever or an increased body temperature helps the human body to fight certain temperature sensitive bacteria or viruses.
An experiment performed by the Chinese scientist, Jian Feng Chen of Shanghai Institute of Biochemistry on mice showed that the injected high temperature in the body of the mice stimulated the T-cell membrane which started secreting heat-shock protein or Hsps, which fights stress.
This study showed that the raised temperature triggers the body immune system to fight a virus or bacteria caused infection.
Answer:
i) Emphysema
ii) Chronic bronchitis
iii) COPD ( Chronic obstructive pulmonary disease)
Explanation:
They all above given diseases cause permanent damage to lungs. Smoking is a major factor causing these diseases.
