GED Science : Muscular and Skeletal Systems
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Example Question #1 : Systems Biology
What structure is responsible for connecting a muscle to a bone?
Ligament
Tendon
Skin
Joint
Tendon
Muscles do not attach directly to bones. Instead, a tendon is used to attach the two structures. Ligaments connect a bone to another bone, while joints are the locations where bones move around one another.
Example Question #1 : Muscular And Skeletal Systems
Which type of muscle is under voluntary control?
Smooth muscle
Skeletal muscle
Cardiac muscle
All muscle is under conscious control
Skeletal muscle
There are three types of muscle in the body: skeletal, cardiac, and smooth muscle. Of the three, skeletal muscle is the only one that can be consciously controlled. Cardiac and smooth muscle are controlled involuntarily.
An example of skeletal muscle is your biceps brachii muscle; you can voluntarily control this muscle to flex your arm. An example of smooth muscle is the muscle surrounding your arteries; you cannot voluntarily contract this muscle to constrict your arteries. Cardiac muscle is found in the heart; you cannot voluntarily choose to slow your heart rate.
Example Question #88 : Ged Science
What is one function of bone marrow?
Glycogen storage
Red blood cell development
Blood filtration
Calcium production
Red blood cell development
Red bone marrow is found in the ends (epiphyses) of long bones such as the femur and is responsible for red blood cell development. Yellow bone marrow is found in the center (diaphysis) of long bones and can store fat for energy.
Blood filtration primarily occurs in the spleen or kidney. Glycogen is primarily stored in the liver. Calcium is released from the mineral matrix of the bone, but is not actually found in the bone marrow.
Example Question #1 : Systems Biology
How does cardiac muscle differ from skeletal muscle?
Only skeletal muscle has sarcomeres
Only skeletal muscle cells have multiple nuclei
Only skeletal muscle is striated
Only cardiac muscle can contract
Only skeletal muscle cells have multiple nuclei
Skeletal and cardiac muscle have quite a bit in common: both are examples of striated muscle that use the sarcomere as the basic functional unit. Sarcomeres are small units that are capable of contracting. When these units line up in a cell, they create a striped appearance known as "striated" or "striations." Both skeletal and cardiac muscle are capable of contracting; this is a key characteristic of any muscle cell.
A primary difference between skeletal and cardiac muscle cells is the number of nuclei each cell possesses. Skeletal muscle cells usually have several nuclei, but cardiac muscle cells usually have only one nucleus per cell.
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