The link where the action
potential of the nerve that meets muscle and causes it to contraction is where excitation-contraction coupling occurs. The T_tubules the
invaginate into the sarcolemma of the muscle cells are the ones that carry the excitation into the muscles. Its depolarization
causes the lateral sacs of the sarcoplasmic reticulum to release ca2+
ions. The ca2+ then bind into their site on troponin and causes the tropomyosin to shift and allow actin to expose
the binding site in which myosin head
will bind and form a cross bridge that is
important in the contraction of the muscle.
1) This system makes your skin water-resistant. When you get wet, the water beads on the surface of your skin because of this system. The epidermis system within the integumentary system is what makes this happen.
2) It helps you maintain body temperature. Because of thermoregulation, your body maintains a steady temperature. If it didn't the chemicals in your body could be offset. Also, when your body temperature rises, your skin produces sweat that evaporates and works to cool you down.
Delta that question is easy
Answer:
El término orgánulo se emplea para referirse a elementos o estructuras celulares que se encuentran en en el citoplasma de las células, cuyas funciones son bastante específicas, los cuales ha contribuido de manera considerable en el proceso evolutivo.
Ahora bien, dicho lo anterior y respondiendo de forma más concreta la pregunta, puede decirse entonces, que el citoplasma representa la parte de la célula que contiene los orgánulos, presentándose con mayor frecuencia en las células eucariotas debido a que poseen una forma determinada, caso contrario de las células procariotas.
Explanation:
Answer: Human population, now over 7 billion, cannot continue to grow indefinitely. There are limits to the life-sustaining resources earth can provide us.
Explanation:
