In geology, a graded bed is one characterized by a systematic change in grain or clast size from one side of the bed to the other. Most commonly this takes the form of normal grading, with coarser sediments at the base, which grade upward into progressively finer onesI just learned about this in our rocks and minerals unit for science,
1. Polar Easterlies in the Northern Hemisphere blow from east to west.
2. Westerlies in the Northern Hemisphere blow from west to east.
3. Trade Winds in the Northern Hemisphere blow from east to west.
4. Polar Easterlies in the Southern Hemisphere blow from east to west.
5. Westerlies in the Southern Hemisphere blow from west to east.
6. Trade Winds in the Southern Hemisphere blow from east to west.
The lymphatic system destroy harmful substances 'By producing antibodies'.
The lymphocytes contained in lymphatic organs are produced with other defence cells by the bone marrow. They are then dispersed to eliminate pathogens.
The resting membrane potential is primarily due to the differences in concentrations of potassium ions.
The high concentration of potassium ions in the intracellular fluid and the high permeability of the cell membrane to potassium ions in comparison to other ions are the main causes of the resting potential.
The potential across a certain cell membrane at rest is known as the resting membrane potential. It is largely determined by the potassium concentration gradient across the cell membrane or the ratio of ICF to ECF potassium in neuromuscular tissues (such as neurons, heart muscle, and skeletal muscle).
The passage of potassium, sodium, calcium, and chloride across the membrane causes variations in its permeability, which in turn affects the resting membrane potential (RMP). The differential in potentials between intracellular and extracellular areas, is acquired by the membrane once it has become polarised.
To learn more about resting membrane potential, refer from
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Question: Which of the following allows groups of skeletal muscle cells to perform coordinated contractions?
Answer: Their sarcolemma is fused to the tendons, allowing them to function without continual nerve stimulation.
Explanation: basically skeletal muscles maintain posture, stabilize bones and joints
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