In arthropods, locomotion is accomplished by muscles that work against
A. each other.
B. the exoskeleton.
C. a hydrostatic skeleton.
D. mineralized bones.
E. the pseudocoel.
B. the exoskeleton.
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All of the following are tenets of the cell
theory EXCEPT that a. all organisms consist of one or more cells. b. the cell is the smallest unit that retains the characteristics of life. c. since the first cell, each new cell is descended from previous cells. d. each cell is composed of products that it manufactures. e. cells may arise spontaneously under certain laboratory conditions
The three types of muscle tissue are cardiac, skeletal, and ___________
Fill in the blank(s) with the appropriate word(s)
The species concept based on careful analysis of the anatomical details of the specimen in question is ________
A) the morphospecies concept B) the phylogenetic species concept C) the biological species concept D) the ecological species concept
During male ejaculation ____
a. smooth muscle of the vas deferens contracts b. prostate contractions are inhibited c. sperm are forced into the epididymis d. the seminal vesicles secrete fluids into the testes e. the bladder sphincter is relaxed