The correct answer is: tighten and contract
This is is the correct
answer because muscle fibers need to first reach an optimal length and
tension ratio or "tighten" in order for the muscle to perform work.
After the muscle has tightened, it can then "contract" which leads to a
decrease in the angle of the joint through force. If the muscle being
used to pull the rope is the bicep on the arm, then the angle between
the forearm and upper arm will decrease, causing the rope to be pulled.
Because of deteriorating pipes or walls or from asbestos put on the walls in older houses
The answer is; Thyroid hormones levels decrease, TRH levels increase, and PRL levels increase.
The thyroid gland is responsible for producing the growth hormone thyroid hormone. When the gland is reduced, then intuitively, the levels of thyroid hormone reduce in the body. This causes the hypothalamus to release thyroid releasing hormone (TRH) in an attempt to spur thyroid hormone production to normal levels. THR, in a domino effect, causes the pituitary to release higher levels prolactin (PRL).