1. Identify the human body system that the following organs belong to:

Brain
Elbow
Stomach
Heart
Kidney
2. Describe how the nervous, skeletal and muscular system work together when you do exercise such as running, swimming or biking?
3. Explain how do the circulatory system and respiratory system work together to transport oxygen through your body?

4. How can an organ, such as the lungs, work for multiple body systems?

Explanation:

1. Brain: Nervous system

Elbow: Skeletal system/muscular system

Stomach: Digestive system

Heart: Circulatory system

Kidney: urinary system

2. The nervous system sends a signal to the muscular system. This allows you to move your muscles, in turn your muscles control the movement of your bones.

3. The unoxygenated blood pumps through the right side of the heart, which then moves it to the lungs. At the lungs the blood becomes oxygenated and then moves to the left side of the heart. The left side then pumps the blood to the rest of the body.

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.

americans began to notice growing differences between the northern and southern sections of the country. there were more people living in cities in the north, which made it more urban. more people lived on farms in the south, which made it more rural. while many people were farmers in the northern states, there were now other ways to make a living, such as working in mechanical cotton gins factories manufacturing cloth, tools and other goods. people in the north supported high tariffs on goods imported from europe because the extra cost encouraged people to “buy american” instead. in the southern states, planters did not like tariffs because they sold most of their production to europe and bought their tools from there as well. southerners believed the protective tariff was something that only northern factory owners keep their profits high. so the southern politicians came up with an idea. they would opt out. they would simply ignore the protective tariff. it was ‘null and void’ in south carolina. the state would not collect the taxes on goods imported into south carolina, no matter what the president said they had to do. this decision led to the nullification crisis.