What does it mean to describe a scientist as skeptical? Why is skepticism considered a valuable quality in a scientist?

4 a muscle cramp is a sudden, painful contraction of a muscle, during which movement is difficult. What is happening at the cell

stiks02 [169]

In the case of the muscular cramps, the muscle contraction starts with the generation of the action potentials from the brain. The action potential causes the release of the calcium ions movement out of the sarcoplasmic reticulum (storage site of calcium). The calcium released in this process causes the contraction of the myofibrils with the help of the ATP molecules. Meanwhile, the calcium is pumped back to the sarcoplasmic reticulum through the fast calcium pumps.

The contraction of one muscle cell generate the action potential in neighboring muscle cells. When the generation of the action potential is stopped, the sarcoplasmic reticulum relaxes as well as the muscle is relaxed. The fast calcium pump is powered by a sodium gradient, and the calcium influx is a result of fast outflux of the sodium ions from the sarcoplasmic reticulum.

In case, the sodium ion is less, the calcium pumps cannot be powered, the calcium ion would remain in myofibril, as a result, the muscle would be contracted for a longer time and this result in cramps. The muscle in this case, would be relaxed by the ATP instead of sodium gradient. So, it can be concluded that the muscle cramps are caused when the muscles are not able to relax properly.

3 0

3 years ago

The digestive tract is essentially a muscular tube that runs from mouth to anus.

maxonik [38]

Answer:

True

I think

Explanation:

5 0

3 years ago

In a standard deck of playing cards, there are four suits (red suits hearts and diamonds, black suits spades and clubs). Each su

Lapatulllka [165]

Answer:

Probability can be calculated by dividing the number of possible outcomes by the total number of outcomes.

probability= $\frac{possible outcomes}{total outcomes}$

There are 4 suits each with 13 cards (10 number and 3 face cards)

Total number of cards = 13 x 4 = 52

1. Probability of having a face card:

There are 3 face cards in each suite and there are four suits in total. Thus, total number of face cards = 3 x 4 = 12

Total number of cards in a deck = 52

Probability of drawing a face cards = $\frac{12}{52}$ = 0.231

2. Probability of drawing a red card:

There are two red suits (red suits heart and red diamonds) each having 13 cards. Thus, total number of red cards = 13 x 2 = 26

Total number of cards in a deck = 52

Probability of drawing a red card = $\frac{26}{52}$ = 0.5

3. Probability of drawing a red face card:

There are two red suits (red suits heart and red diamonds) each having 3 face cards. Thus, total number of red cards = 3 x 2 = 6

Total number of cards in a deck = 52

Probability of drawing a red card = $\frac{6}{52}$ = 0.115

3 0

4 years ago

DNA is referred to as a______, meaning that it has<br> strands that are______together.

Yuki888 [10]

Answer:

molecule

wound

Explanation:

DNA is the chemical name for molecule. The strands wind together and form a double helix.

5 0

3 years ago

Read 2 more answers

if another praire dogs migrates into an area , whats most likely to happen the praire dogs populution

olasank [31]

If multiple praire dogs (at least two) migrate into another area the population should slowly increase as long as the praire dogs are able to reproduce.

5 0

4 years ago