Which of the following results from cleavage? a) body segmentation b) formation

Question

Which of the following results from cleavage? a) body segmentation b) formation of the digestive system c) formation of the nervous system d) formation of an embryonic stage with many cells called blastula e) formation of the notochord What occurs during gastrulation? a) A circulators system is created from the endoderm. b) A nervous system is created from the endoderm. c) Development of an embryo with three lasers. d) A gastrula becomes an embryo with five tissue layers. e) A solid embryo is changed into a hollow blastula. In all animals, the epidermis of the skin and its derivatives (hairs, sweat glands, etc.) develop from a) the ectoderm b) the mesoderm. c) the endoderm. d) all of the those germ layers. e) none of the those What part of a nerve cell carries signals from the cell body ? a) dendrite b) receptor c) soma d) axon e) nucleus The central nervous system (CNS) of vertebrates includes a) brain and spinal cord b) sense organs and nerves c) all the ganglia of the body d) only the white matter of the brain e) none of the above Which of the following statements regarding the nervous system is true? a) Motor neurons convey signals from the CNS to muscle cells. b) The central nervous system (CNS) is composed entirely of nerves. c) Sensory neurons convey signals from the CNS to glands. d) The CNS and the cerebrum are the same thing. e) Interneurons convey signals from sensory receptors into the CNS. Which of the following statements regarding the peripheral nervous system (PNS) is false? a) The sympathetic division is part of the PNS. b) Nerves are part of the PNS. c) The brain is part of the PNS. d) The parasympathetic division is part of the PNS. e) The enteric division is part of the PNS. Which of the following are cells of the nervous system? a) sensory neurons b) interneurons c) motor neurons d) glial cells e) all of the above The autonomic nervous system a) is part of the central nervous system b) carries signals to and from skeletal muscles. c) regulates the internal environment of the body. d) integrates sensory inputs to the brain. e) is mostly voluntary. In all vertebrates, the embryonic brain divides first into three regions called a) forebrain, midbrain, and hindbrain. b) cerebrum, cerebellum, and enteric ganglia. c) cerebrum, forebrain, and spinal cord. d) cerebrum, nerves, and hindbrain. e) cerebrum, cerebellum, and spinal cord. Which of the following is a brain structure? a) cerebrum b) cerebellum c) pons d) medulla oblongata e) all of the above are brain structures Smooth muscle propels food through the alimentary canal by a) diffusion. b) progurgitation. c) circular contractions. d) peristalsis. e) active transport Which of the following parts of the circulatory system has the highest blood pressure? a) arterioles b) aorta c) venules d) vena cava e) capillaries

Explanation / Answer

31)c during gastrulation the embryo differentiates into three layers ie ecto, meso and endo derm

32) a the epidermis and it's derivatives are formed from ectoderm or the outermost layer of the germ layers.

33)a dendrites. Small projections on neurons recieving signals.

34)a brain and spinal cord are parts of CNS in humans and other vertebrates.

35)a motor neurons carry signals from CNS to musle in order for the activity to occur.

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