El sarcolema, o membrana plasmática de una célula muscular, ayuda a mantener un gradiente de concentración de iones de calcio entre el citoplasma de la célula muscular y el líquido extracelular. Cuando una célula muscular recibe una señal para contraerse, el calcio (Ca+2) se mueve a favor de este gradiente y pasa del espacio extracelular hacia el citoplasma de la célula. ¿Cuál de los siguientes es el mecanismo más probable por el cual el Ca+2 atraviesa el sarcolema durante la contracción de la célula muscular? a. El Ca+2 fluye a través de acuaporinas
b. El Ca+2 pasa por canales proteicos de la membrana
c. El Ca+2 se transporta por proteinas periferales

Many organs are involved in the processes of keeping the blood and the body clean. when poisonous or harmful substances are in the blood, they are absorbed by the and released in a less harmful form. when wastes are present in the blood, they are filtered out and removed from the body by the

Use this dichotomous key for insect identification to identify the insect shown. 1. a. insect has one pair of wings. order diptera b. insect has two pairs of wings. go to #2 2. a. front wings thicker in texture than hind wings go to #3. b. front and hind wings are same texture throughout. go to #4 3. a. front wings are short order dermaptera b. front wings cover entire abdomen order coleoptera 4. a. wings with scale on all parts of their area. order lepidoptera b. wings without scales go to #5. 5. a. hind wings smaller than front wings. order ephemeroptera b. front and hind wings nearly equal in size. order odonata the insect pictured is in the order diptera. ephemeroptera. coleoptera. odonata.

What makes a dominant allele different from a recessive allele