Select all that are true regarding a resting muscle fiber.

Out of the following given choices;

1) There is a charge difference across the sarcolemma.

2) Sodium-potassium pumps are active.

3) Calcium is stored in the sarcoplasm.

4) ACh receptors are open.

The answer is 1, 3 and 4. When a muscle is at rest, the Ca2+ ions are still sequestered in the sarcoplasm until an impulse induces depolarization. ACh receptors are also not bound by acetylcholine which is the primary receptor-neurotransmitter in muscle for motor nerve-muscle communication that controls muscle contraction.

most community's take hundreds of years to become stable

1: most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40% sand, 40% silt, and 20% clay) with ample organic matter and pore space. however, some plants grow better in sandy soils, while others are well-adapted to clay soils.

2: available water capacity is the maximum amount of plant available water a soil can provide. it is an indicator of a soil's ability to retain water and make it sufficiently available for plant use. available water capacity is the water held in soil between its field capacity and permanent wilting point.

3: it is the same for all living things (plants and animals). it also includes very tiny organisms that our eyes cannot see. they are known as microorganisms, and include viruses, bacteria and fungi.