Answer:
a)The brain is protected by the bones of the skull and by a covering of three thin membranes called meninges.
b) Even before you leave the womb, your brain works throughout your life to control your body's functions and helps you understand and interact with the world around you.
Explanation:
Treatment and care for seizures that last more than 5 minutes and for status epilepticus. Many people have seizures that last for less than 5 minutes and stop without any treatment. However, some people have seizures that last longer than 5 minutes.
The close relation between dance and music is based on the fact that both are organized around rhythmic pattern; thus, the rhythm of the accompanying music may be used to determine the rhythm of the dance, to give it emphasis, or to help the dancers maintain the same beat.
Answer:
1. spontaneously
2. resting potential
3. action potentials
4. pacemaker potentials
5. K+
6. Na+
7. into
8. Ca+
Explanation:
Pacemaker cells (also known as sinoatrial node cells) are cells that generate rhythmic impulses and set the pace for blood pumping in the heart. These cells have the ability to rhythmically depolarize and initiate action potentials. In pacemaker cells, Ca2+ and Na+ levels are higher in the extracellular environment, while K+ concentration is higher intracellularly. The pacemaker action potentials have three phases: 1-depolarization, where membrane potential reaches -40 mV and voltage-gated Ca2+ channels open, 2-repolarization, where voltage-gated Ca2+ channels close and voltage-gated K+ channels open, and finally 3-gradual depolarization, which is caused by the slow influx of Na+ ions.
