Answer:
The volume of a cylinder is expressed as:
Volume = πr²h
where r is the radius of the base and h is the height of the cylinder. If the r is doubled then,
Volume = π(2r)²h
Volume = 4πr²h
The volume is four times as much the original volume.
Answer:
DNA changes caused by mutagens may harm cells and cause certain diseases, such as cancer. Examples of mutagens include radioactive substances, x-rays, ultraviolet radiation, and certain chemicals.
Explanation:
A. The medication developed to treat gonorrhea is extremely expensive; many people cannot afford it, and must leave the infection untreated to spread throughout the body.
B.The symptoms for gonorrhea are sometimes mild; this means people often leave it untreated because they do not know they have any type of infection at all.
C. The antibiotic used to treat gonorrhea is experimental; this means it is not covered by insurance and is only available in certain countries to people who can afford it.
D. The symptoms for gonorrhea are easily mistaken for other infections; this means people take the wrong medications that actually cause the infection to spread.
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Answer:
Explanation:
The Respiratory System
The thoracic cage, sometimes called the rib cage, is a bony structure that is narrower at the top and wider at the base. It is held in place by the thoracic vertebrae of the spine in the center of the back and by the sternum in the center of the anterior aspect of the body. The first seven ribs attach directly to the sternum and are called the true ribs. Ribs 8, 9, and 10 fasten one to another, forming the false ribs, and ribs 11 and 12 are the “floating” ribs, or half ribs, because their only attachment is to the thoracic vertebrae. At the base or floor of the rib cage is the diaphragm, a musculotendinous membrane that separates the thoracic cavity and the abdominal cavity (Figure 46-1). The respiratory system is divided into two anatomic regions, the upper respiratory tract and the lower respiratory tract.
Upper Respiratory Tract
The upper respiratory tract, which transports air from the atmosphere to the lungs, includes the nose, pharynx (throat), and larynx (Figure 46-2). As air enters the nasal cavity, it is cleaned by the cilia, warmed by capillary blood vessels, and moistened by mucous membranes. The paranasal sinuses, hollow cavities that also are lined with mucous cells and cilia, open into the nasal cavity and help warm and moisten inhaled air. The filtered, warmed, and moistened air moves past the tonsils, which have an immunity function and help defend the body from potential pathogens, and through the pharynx. As the air continues toward the lungs, it passes through the larynx. The opening into the larynx is protected by a moveable piece of cartilage, the epiglottis. The larynx, or voice box, is made up of vocal cords, which vibrate when air is exhaled, creating the sound of the voice. Once the air passes through the larynx, it enters the lower respiratory tract.
