Which of the following statements is always true?
A. center of volume is in the same place as center of mass
B. center of volume is in the same place as center of buoyancy
C. center of mass is in the same place as center of buoyancy
D. all of the above are true
B. center of volume is in the same place as center of buoyancy
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Match the following:
A) Stratum basale B) Stratum corneum C) Sudoriferous glands D) Vellus 1) The layer of the epidermis where the cells are considered protective but nonviable. 2) The glands that serve an important function in thermoregulation. 3) The layer that contains the mitotic viable cells of the epidermis. 4) Hair that lacks pigment and is often called "immature hair."
Place the following events of excitation in the correct order
1. ion channels on the sarcolemma open and sodium ions enter the muscle fiber 2. the entry of sodium ions into the muscle fiber depolarizes the sarcolemma locally 3. acetylcholine is released from vesicles in the motor neuron into the synaptic cleft 4. an action potential arrives at the axon terminal of a motor neuron 5. acetylcholine binds to ligand-gated sodium ion channels in the motor end plate A) 2, 4, 3, 5, 1 B) 3, 4, 5, 1, 2 C) 4, 5, 3, 2, 1 D) 4, 3, 5, 1, 2
Epithelium that consists of a single layer of cells, in which some cells are tall and thin and reach the free surface and others do not, is classified as
A) simple columnar epithelium. B) pseudostratified columnar epithelium. C) stratified squamous epithelium. D) transitional epithelium. E) simple squamous epithelium.
Most if not all of a zygote's chromosomes come from the
A. ovum. B. sperm.