Answer:
spinal cord axoion spine all might be related to your question
Cold ocean water flows from the north pole towards south and affects the climate locations near the Atlantic Ocean.
Answer:
1. false
2. true
3. true
Explanation:
1. Annuals are the plants that complete their life cycle in one season or one year. These are the herbaceous plants that grow, flower and die in one season. Examples of annuals are geranium, marigold, etc.
2. In a flower, the whorl of petals is called corolla while the whorl of the sepal is known as calyx. In flowers, calyx and corolla together make perianth. The calyx is outer to corolla in a perianth.
3. The fruit is a matured and ripened ovary that provides protection to the seeds present in it. Fruits are formed after fertilization and may contain one or more seeds. Tomatoes are the simple berry fruits while cucumber is pepo, the modified berries. Broccoli is the flower head while celery is the edible leaf.
Answer:
The prolonged electrical depolarization of cardiac muscle cells -that occurs during contraction- is due primarily to the persistent influx of calcium ion
Explanation:
The action potential of the heart muscle is longer with respect to skeletal muscle (around 300 milliseconds), and this is due to the activity of calcium (Ca⁺⁺ ) in the intracellular compartment.
The initial depolarization of cardiac muscle fiber depends on the entry of sodium (Na⁺) into the cell. However, for the action potential to occur and be maintained, Ca⁺⁺ must increase its cytoplasmic levels, which depends on:
- The increase in intracellular sodium induces the release of Ca⁺⁺ from the sarcoplasmic reticulum.
- Calcium entry from the extracellular space through the voltage dependent Ca⁺⁺ channels.
- The entry of extracellular Ca⁺⁺ causes the release of more Ca⁺⁺ ions by the sarcoplasmic reticulum, further increasing its intracellular concentration.
This is how the ion that guarantees the duration of the action potential of the cardiac muscle cell is the Ca⁺⁺.
Learn more:
Calcium, sodium and cardiac muscle cells brainly.com/question/4473795
Yes, it is a weak acid called the citric acid
