Extracellular matrix is ________.
A) composed of strands of actin protein
B) the most abundant extracellular material
C) a type of impermeable cell junction found in epithelia
D) not present in connective tissue
B) the most abundant extracellular material
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Individuals who are described as heterozygous have different
A. genotypes than the predominant genotype. B. genes for one trait on several chromosomes. C. alleles for a particular trait. D. parents who displayed two different phenotypes.
Answer the following statements true (T) or false (F)
1. The intercalated disks that link the heart cells assist in the efficient conduction of the heart contraction. 2. The sinoatrial node is sometimes called the pacemaker of the heart. 3. The AV node initiates the contraction of the atria. 4. The Purkinje fibers and the bundle of His are involved in the contraction of the ventricles. 5. A patient with a serious heart block may be treated with an artificial pacemaker.
Blood travels from the left atrium to the left ventricle through the
A) fossa ovalis. B) semilunar valve. C) conus arteriosus. D) mitral valve. E) tricuspid valve.
Which of the following refer to the division of the cranial and sacral segments of the spinal cord?
a. Craniosacral division. b. Sacralcranium division. c. Cranio and sacral aspects d. Proprioception.