The main function of the respiratory system is to ________
A) transport oxygen, nutrients, and wastes to and from body cells and tissues
B) produce sperm and eggs
C) supply the body with oxygen and remove carbon dioxide
D) control body activities through hormones released into the blood
E) break down food and deliver the products to the blood for dispersal
C
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The sympathetic nervous system and the parasympathetic nervous system
a. generally exert opposite effects on visceral organs. b. are sensory and motor, respectively. c. are central and peripheral, respectively. d. are autonomic and automatic, respectively. e. are generally excitatory and inhibitory, respectively.
Which of the following bones belongs in the axial skeleton?
A) clavicle B) phalanges C) fibula D) sternum
Describe the muscular layer of the esophagus
A) inner circular layer and outer longitudinal layer; superior third is skeletal muscle, middle third is mixed skeletal and smooth muscle, inferior third is smooth muscle B) inner longitudinal layer and outer circular layer; superior third is skeletal muscle, middle third is mixed skeletal and smooth muscle, inferior third is smooth muscle C) inner circular layer and outer longitudinal layer; superior third is smooth muscle, middle third is mixed skeletal and smooth muscle, inferior third is skeletal muscle D) inner longitudinal layer and outer circular layer; superior third is smooth muscle, middle third is mixed skeletal and smooth muscle, inferior third is skeletal muscle E) inner circular layer, middle oblique layer, outer longitudinal layer; inner layer is smooth muscle, middle oblique layer is mixed smooth and skeletal muscle, outer longitudinal layer is skeletal muscle
The largest lipoproteins, ________, are produced by intestinal epithelial cells from the fats in food
A) very-low-density lipoproteins (VLDLs) B) low-density lipoproteins (LDLs) C) intermediate-density lipoproteins (IDLs) D) high-density lipoproteins (HDLs) E) chylomicrons