Unit 1 : The Human Body
Lesson 2 : Holding It All Together : Muscles and Bones
1. In which way does the circulatory system rely on the skeletal system?
A. Glucose is secreted by compact bone as an energy source for blood.
B. Spongy bone stores minerals needed by blood cells
C. Bones provide a source of oxygen to blood
***D. Blood cells are produced in bone marrow.
2. A rock climber climbs up the rock wall. How do the bones and muscles in his arm interact to allow him to climb up?
A. All of the muscles in his arm contract as he climbs up.
***B. His arm muscles work in pairs so that one contracts while the other relaxes as he climbs up.
C. His arm muscles work independently of each other as he climbs up.
D. All of his arm muscles relax as he climbs up.
3. Muscles located in the walls of the small intestine help push digested material along. Muscles located in the walls of arteries help push blood along. Based on this information and your understanding of muscle types, which of the following statements is correct?
***A. Both sets of muscles are involuntary and smooth
B. Both sets of muscles are voluntary and smooth
C. Both sets of muscles are smooth, although one set is voluntary, and the other set is involuntary.
D. Both sets of muscles are voluntary, although one set is striated, and the other set is smooth.
Which of the following sets of words best fills in the blanks in the following sentence?
Despite their _____ structure, human bones are surprisingly _____.
***A. hollow ; strong
B. solid ; lightweight
C. compact ; flexible
D. spongy ; fragile
100% correct, have a good day!
To answer the questions:
1. In which way does the circulatory system rely on the skeletal system?
D. Blood cells are produced in bone marrow.
To answer this question, we need to understand the relationship between the circulatory system and the skeletal system. The circulatory system is responsible for transporting blood throughout the body, while the skeletal system is composed of bones.
Within certain bones in our body, such as the long bones, there is a soft tissue called bone marrow. Bone marrow is responsible for the production of blood cells including red blood cells, white blood cells, and platelets. These blood cells are essential for carrying oxygen, protecting against infection, and blood clotting, respectively.
Therefore, the circulatory system relies on the skeletal system's bone marrow to produce blood cells, making answer choice D correct.
2. A rock climber climbs up the rock wall. How do the bones and muscles in his arm interact to allow him to climb up?
B. His arm muscles work in pairs so that one contracts while the other relaxes as he climbs up.
To answer this question, we need to understand how muscles and bones interact during movement. Muscles are responsible for producing force and movement, while bones provide structure and serve as attachment points for muscles.
In the context of climbing, the muscles in the climber's arm work in pairs, with one muscle contracting while the other relaxes. This occurs through a specialized arrangement of muscles called antagonistic muscle action. One muscle, known as the agonist, contracts to produce the desired movement (in this case, contracting to flex the arm and pull the climber upward), while the other muscle, known as the antagonist, relaxes to allow the movement to happen smoothly. As the climber grips and pulls up using their arm muscles, the coordinated contraction and relaxation of muscles in their arm allows them to climb.
Therefore, answer choice B is correct.
3. Muscles located in the walls of the small intestine help push digested material along. Muscles located in the walls of arteries help push blood along. Based on this information and your understanding of muscle types, which of the following statements is correct?
A. Both sets of muscles are involuntary and smooth.
To answer this question, we need to understand the characteristics of the muscles involved in these two processes: pushing digested material along the small intestine and pushing blood along arteries.
The muscles in the walls of the small intestine and arteries are both types of smooth muscles. Smooth muscles are characterized by their involuntary nature and their smooth appearance under a microscope. They are not under voluntary control, meaning we can't consciously control their contractions.
Muscles in the walls of the small intestine help move digested material along through a process called peristalsis, which involves coordinated, involuntary contractions of smooth muscles. Similarly, muscles in the walls of arteries, known as vascular smooth muscles, contract and relax to regulate blood flow and maintain blood pressure.
Therefore, answer choice A is correct.
Lastly, let's address the fill-in-the-blank question:
Despite their _____ structure, human bones are surprisingly _____.
A. hollow; strong
To complete the sentence, we need to choose the words that accurately describe the characteristics of human bones.
Human bones are not hollow but rather have a solid structure, providing strength and support to our body. Additionally, human bones are indeed strong, as they are capable of withstanding a significant amount of force and stress.
Therefore, answer choice A is the best fit for the blanks, making it the correct answer.