A rock climber grasps onto a ledge in the rock wall. How do the bones and muscles in his arm interact to allow him to hold on?
photo of a man climbing a rock wall
All of the muscles in his arm contract to hold his arm in position.
His arm muscles work in pairs so that one contracts while the other relaxes to hold his arm in position.
His arm muscles work independently of each other to hold his arm in position.
All of his arm muscles relax to hold his arm in position.
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? (1 point)
Both sets of muscles are involuntary and smooth.
Both sets of muscles are voluntary and smooth.
Both sets of muscles are smooth, although one set is voluntary, and the other set is involuntary.
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 _________.
solid; lightweight
compact; flexible
spongy; fragile
rigid; durable
A rock climber grasps onto a ledge in the rock wall. How do the bones and muscles in his arm interact to allow him to hold on?
The correct answer is: His arm muscles work in pairs so that one contracts while the other relaxes to hold his arm in position.
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?
The correct answer is: Both sets of muscles are involuntary and smooth.
Which of the following sets of words best fills in the blanks in the following sentence?
Despite their ______ structure, human bones are surprisingly _________.
The correct answer is: solid; lightweight.
A rock climber's ability to hold onto a ledge on a rock wall relies on the interaction between the bones and muscles in his arm. When a rock climber grasps onto a ledge, the muscles in his arm contract, creating tension and allowing the arm to remain in position. The contraction of these muscles requires an interconnected network of bones and tendons.
In terms of the answer choices provided:
- "All of the muscles in his arm contract to hold his arm in position" is not entirely accurate, as it implies that all muscles are simultaneously contracting, which is not the case.
- "His arm muscles work in pairs so that one contracts while the other relaxes to hold his arm in position" is a more accurate representation. The muscles in the arm generally work in opposing pairs, where one muscle contracts to create movement or tension, while its counterpart relaxes.
- "His arm muscles work independently of each other to hold his arm in position" is not accurate. The muscles in the arm work in coordination with each other rather than independently.
- "All of his arm muscles relax to hold his arm in position" is incorrect, as muscles need to contract to provide the necessary tension for holding onto the ledge.
Regarding the second question:
Muscles located in the walls of the small intestine and arteries serve different functions. The muscles in the walls of the small intestine help push digested material along, while the muscles in the walls of arteries help push blood along. Based on this information:
- "Both sets of muscles are involuntary and smooth" is the correct answer. Both the muscles in the walls of the small intestine and arteries are involuntary (meaning they are not under conscious control) and smooth (meaning they lack striations when viewed under a microscope).
Finally, in the third sentence:
To fill in the blanks in the sentence "Despite their ______ structure, human bones are surprisingly _________," the best choice from the options given is "compact; flexible." Human bones have a compact structure, referring to their dense and strong nature, while also possessing flexibility to a certain degree. The other options, such as "solid; lightweight" or "spongy; fragile," do not accurately describe human bones.