Body Systems

The cells in the picture are from the same animal. Which of the following explains why they look different?

Las células en la imagen son del mismo animal. ¿Cuál de las siguientes explica por qué se ven diferentes?

• They have different functions.

• Picture 2 cells are young and still growing.

• They have different DNA.

• Picture 1 cells are diseased and damaged.

How do the heart and lungs work together?

¿Cómo funcionan juntos el corazón y los pulmones?

• The heart pumps blood and lungs circulate blood throughout the body.

• The heart and lungs work together to help digest food.

• Movement of the lungs helps the heart pump blood.

• The lungs supply oxygen to the blood that the heart pumps throughout the body.

Where does your body use the food that has been digested?

¿Dónde usa su cuerpo la comida que ha sido digerida?

• in the stomach only.

• in the lungs only.

• in all of the body's cells.

• in the blood only.

Which of the following describes systems that must work together to bring oxygen to a muscle?

¿Cuál de los siguientes describe sistemas que deben funcionar juntos para llevar oxígeno a un músculo?

• respirations and circulation

• circulation and reproduction

• digestion and respiration

• digestion and reproduction

The main human organ that excretes nitrogen waste is the

El principal órgano humano que excreta residuos de nitrógeno es el

• lymph node

• kidney

• liver

• sweat gland

The breakdown of fat by bile is an example of chemical digestion. Which two systems work together to accomplish this?

La descomposición de la grasa por bilis es un ejemplo de digestión química. ¿Qué dos sistemas trabajan juntos para lograr esto?

• Circulatory and Digestive

• Digestive and Integumentary

• Digestive and Nervous

• Excretory and Circulatory

Which part of the cell allows nutrients and other materials to enter or leave the cell?

¿Qué parte de la célula permite que los nutrientes y otros materiales entren o salgan de la célula?

• cell membrane

• nucleus

• chloroplast

• cytoplasm

What is a chemical referred to in the diagram?

¿Qué es un químico referido en el diagrama?

• an enzyme detected by a cell membrane receptor.

• DNA necessary for regulating cell functions.

• a food molecule taken in by an organism.

• a hormone important in maintaining homeostasis.

A student's heart rate is 72 bpm at rest. After exercise, the heart rate goes up to 11 bpm. After 20 minutes of rest, it is back to 72 bpm. This series of events illustrates-

La frecuencia cardíaca de un estudiante es de 72 lpm en reposo. Después del ejercicio, la frecuencia cardíaca sube a 11 lpm. Después de 20 minutos de descanso, vuelve a 72 bpm. Esta serie de eventos ilustra

• respiration

• homeostasis

• excretion

• extrapolation

An athlete produces a lot of sweat during a long run on a hot day. As a result, the kidneys change the rate of urine production. Why is this change important?

Un atleta produce mucho sudor durante una carrera larga en un día caluroso. Como resultado, los riñones cambian la tasa de producción de orina. ¿Por qué es este cambio importante?

• increased urine production removes amino acids.

• increased urine production allows more water to remain in the bloodstream.

• decreased urine production allows the body to conserve water.

• decreased urine production increases the amino acids in the blood.