Osteoblasts involved in bone growth in length come primarily from
A. chondrocytes.
B. connective tissue surrounding blood vessels from the endosteum.
C. osteocytes.
D. periosteum.
E. endothelium of blood vessels.
B
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The motor-end plate
1.contains nicotinic acetylcholine receptors. 2.contains muscarinic acetylcholine receptors. 3.always initiates action potentials when stimulated by the neurotransmitter from a motor neuron. 4.is the region of the motor neuron that releases the neurotransmitter. 5.is the region where motor neuronal axon terminals enter the muscle cell cytoplasm
Sara is color blind. Her classmates don't believe her and say that color blindness can only occur in males. Which of the following would explain Sara's inheritance of color blindness best to her classmates?
A. Sara is heterozygous for color blindness, inheriting one mutant copy of the gene from her father. B. Sara is color blind because she inherited a recessive allele from her mother and a normal allele from her father. C. Sara is homozygous recessive for color blindness, inheriting the mutant alleles from her father and her mother.
The detrusor muscle
A) moves urine through the ureters through peristaltic contractions. B) compresses the urinary bladder and expels urine through the urethra. C) exclusively functions as the internal urethral sphincter. D) exclusively functions as the external urethral sphincter. E) provides voluntary control over the discharge of urine from the bladder.
At the end of meiosis I there are ________, whereas at the end of meiosis II there is/are ________
A) two diploid cells; four haploid cells B) two diploid cells; one diploid cell C) two diploid cells; one haploid cell D) two haploid cells; one diploid cell E) two haploid cells; four haploid cells