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1.1 The study of life Read Online
Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.
Chapter 35: The Nervous System MCQ Multiple Choices Questions Quiz Test Bank
35.1 Neurons and Glial Cells
35.2 How Neurons Communicate
35.3 The Central Nervous System
35.4 The Peripheral Nervous System
35.5 Nervous System Disorders
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Question: The ________ lobe contains the visual cortex.
Choices:
frontal
parietal
temporal
occipital
Question: A(n) ________ neuron has one axon and one dendrite extending directly from the cell body.
Choices:
unipolar
bipolar
multipolar
pseudounipolar
Question: Where are parasympathetic preganglionic cell bodies located?
Choices:
cerebellum
brainstem
dorsal root ganglia
skin
Question: Activation of the sympathetic nervous system causes:
Choices:
increased blood flow into the skin
a decreased heart rate
an increased heart rate
increased digestion
Question: Glia that provide myelin for neurons in the brain are called ________.
Choices:
Schwann cells
oligodendrocytes
microglia
astrocytes
Question: After an action potential, the opening of additional voltage-gated ________ channels and the inactivation of sodium channels, cause the membrane to return to its resting membrane potential.
Choices:
sodium
potassium
calcium
chloride
Question: For a neuron to fire an action potential, its membrane must reach ________.
Choices:
hyperpolarization
the threshold of excitation
the refractory period
inhibitory postsynaptic potential
Question: What is the term for protein channels that connect two neurons at an electrical synapse?
Choices:
synaptic vesicles
voltage-gated ion channels
gap junction protein
sodium-potassium exchange pumps
Question: Neurons contain ________, which can receive signals from other neurons.
Choices:
axons
mitochondria
dendrites
Golgi bodies
Question: The ________ connects the two cerebral hemispheres.
Choices:
limbic system
corpus callosum
cerebellum
pituitary
Question: Neurons in the ________ control motor reflexes.
Choices:
thalamus
spinal cord
parietal lobe
hippocampus
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