Answer:
The correct answer will be option A - A-band.
Explanation:
The sarcomere is the repeating unit of a myofibril which extends between two z-lines. Under a microscope, a sarcomere can be divided into A- band which is composed of thick myosin only and I-band which consists of thin filament that is actin only.
When a muscle contract then actin and myosin comes in overlapping position due to which I-band shortens and between two z-lines and overlapped structure of thin actin filaments over thick myosin filaments (A-band) is seen.
Therefore, only A-band is seen between two z-lines in a contracted muscle thus, option A is the correct answer.
Answer: Prolactin
Explanation:
The placenta is an endocrine gland that is present in the women's body during the time of pregnancy.
When a women is pregnant there is a connecting link in between the child and mother that transfers nutrients to the fetus and carries waste materials from the body of the fetus to mother's body.
Placenta also releases some hormones which includes Chorionic gonadotropin, estrogen, placental lactogen, progestrone.
Answer:
Mental stress provide most change in the cardiovascular readings .
Explanation:
Mental stress -
Mental stress influences most of the change in cardiovascular system. During mental stress, the body releases cortisol and adrenaline. These are the fight hormones secreted from adrenal gland. They will increase the heart rate and blood pressure to fulfill the extra need in response to stress. Prolonged secretion of such hormone may lead to cardiovascular dysfunctions.
However, physical stress is also harmful for CVS and does make changes. but physical stress tends to get over once the activity is ceased.
Mental stress has prolonged cardiovascular risks .
Answer: A. Lou Gehrig Disease.
Explanation:
An eponym is named after a person, place, or thing.
Answer:
what?? I'm not sure what you are trying to say here??
