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3 years ago

Molecules helped by protein; move insoluble molecules across plasma membrane:

Biology

1 answer:

Annette [7]3 years ago

3 0

Answer:

I think its facilitated diffusion.

Explanation:

<h3 /><h3>Hope it helps out :)))</h3>

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Cross bridge formation between myosin heads and actin molecules is caused by the elevation of calcium ion concentration in the c

Naily [24]

Answer:

by the sarcoplasmic reticulum's calcium ion pumps

Explanation:

Rigor mortis or postmortem rigidity, is a state caused by chemical changes in the muscles that occur post mortem and cause the limbs of the corpse to stiffen.

This occurs because after death, there is no cellular respiration and consequently, no oxygen nor ATP (ATP is required for the muscle relaxation).

Calcium enters the cytosol after death because it is released due to the deterioration of the sarcoplasmic reticulum and due to the breakdown of the sarcolemma. Ca2+ ions activate the formation of actin-myosin cross-bridging necessary for the contraction. Muscles are unable to relax, because myosin heads continue to bind with the active sites of actin and there is no ATP to destabilize the myosin-actin bond.

8 0

3 years ago

Calculate the net filtration pressure if capillary hydrostatic pressure is 60 mm Hg, capillary osmotic pressure is 25 mm Hg, and

alina1380 [7]

Well you can go on youtube and look up how to do it

6 0

3 years ago

How many sperm cells are created from the process of meiosis

Lorico [155]

While mitosis produces 2 daughter cells from each parent cell, meiosis results in 4 sex cells, or gametes in males and 1 in females. Unlike the cells created by mitosis, gametes are not identical to the parent cells. In males, meiosis is referred to as spermatogenesis because sperm cells are produced.

6 0

3 years ago

Rock is a type of Earth material. Most rock is made up of _______.

Alexxandr [17]

Answer:

Rock is a type of Earth material. Most rock is made up of minerals.

Hope this helps you

8 0

3 years ago

A student does an experiment for a science fair to study whether temperature affects the timing of a cricket’s chirps. The stude

Galina-37 [17]

Answer:The timing of the cricket's depends on the temperature of the box

so the answer should be

timing of the cricket's chirps

Explanation:Hi!

There are a few types of variables in these types of experiments. They are independent, dependent, and controlled.

The independent is the one changed by the scientist, or in this case, the temperature. The controlled is the things that remain constant through every case, and the dependent is what is being observed, seeing if it changes through the altercation of the independent variable.

In this case, what is being observed is the timing of a cricket's chirps, because it is being watched whether or not temperature affects it.

Therefore, your answer is the third choice, or the timing of the cricket's chirps.

Hope this helped!

4 0

3 years ago

Read 2 more answers