Explain why exercise does not offset the detrimental effects of cigarette smoking.
What will be an ideal response?
Smoking greatly decreases the ability of the blood to transport oxygen to working muscles. Oxygen is carried in the circulatory system by hemoglobin, the iron-containing pigment of the red blood cells. Carbon monoxide, a by-product of cigarette smoke, has 210–250 times greater affinity for hemoglobin over oxygen. Consequently, carbon monoxide combines much faster with hemoglobin, decreasing the oxygen-carrying capacity of the blood. Chronic smoking also increases airway resistance, requiring the respiratory muscles to work much harder and consume more oxygen just to ventilate a given amount of air. If a person quits smoking, exercise does help increase the functional capacity of the pulmonary system.
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Fill in the blank(s) with correct word
A narrowing of the urethra is called a:
A. urinary catheterization B. ureterocele C. urethral stricture D. ureterolithiasis
Which of the following methods of contraception works to prevent the sperm from reaching an egg?
A) natural B) barrier C) hormonal D) surgical
Twins produced when two eggs are released by the ovary and fertilized by two separate sperms are referred to as ________ twins.
A. monozygotic B. zygotic C. bizygotic D. parazygotic E. dizygotic