Una persona se encuentra almorzando, en ese momento se genera en él una situación de estrés, por una discusión que se presenta. Si pudiéramos observar internamente el cuerpo de la persona, lograríamos percibir lo siguiente: la actividad del tracto
digestivo disminuye, y parte del torrente sanguíneo
se dirige de forma rápida hacia los músculos de los
brazos y las piernas, se acelera la frecuencia cardiaca, las pupilas se dilatan y las vías respiratorias
se expanden para permitir la entrada de más aire a
los pulmones.

• ¿Cómo crees que intervienen en esta situación
las diferentes partes del sistema nervioso?
• Elabora un dibujo que represente la situación.
• ¿Cuáles crees que serían las reacciones del
cuerpo cuando esa persona se calme?

You have a solution that contains phospholipid vesicles in a test tube. these vesicles have phospholipid bilayers, but do not contain any membrane transporters. you add a number of different molecules to the solution, and wait a period of time for them to equilibrate. if you could measure the concentration of each molecule, for which of the following would you expect to measure equal concentrations inside and outside of the vesicles? assume for this question that the overall osmolarity inside and outside the vesicles is the same (that is, there is no appreciable diffusion of water across the membrane). (select two answers) an amino acid with a hydrophobic side-chain a small non-polar molecule a negatively charged ion a small polar molecule a small lipid hormone

How is the male reproductive system different from other body systems? it isn’t necessary to vital signs. it monitors other body systems, and adjusts if necessary. it transports items from one system to another. it is the only system that produces hormones in the male.

After getting the slide and microscope ready, stella is eager to see the microscopic pond water specimen! she crouches around her microscope and aligns her eye with the microscope’s eyepiece. but she's only able to see a bright white light. at this point, no specimens or cells are visible on stella's pond water slide. after taking a moment to collect her thoughts, stella realizes she can't see any lifeforms because .