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WorksheetsCOORDINATION 2.0
Total questions: 10
Worksheet time: 5mins
Which of the followings a true statement about the threshold potential of a membrane
It is equal to about 35 mV
It is equal to about 70 mV
It opens voltage-sensitive gates that result in the rapid outflow of sodium ions
It is the depolarization that is needed to generate action potential
Saltatory conduction is a term applied to conduction of impulses
Across electrical synapses
Along the postsynaptic membrane from dendrite to axon hillock
In two directions at the same time
Along myelinated nerve fibers
Neurotransmitters are released from presynaptic membrane to synaptic cleft by process of
Osmosis
Diffusion
Active transport
Exocytosis
The role of calcium ions during the muscle contraction is to
Form tropomyosin-troponin complex
Bind with tropomyosin to expose the myosin head
Deactivates ATPase on myosin binding site on action
Bind with troponin to allow the formation of cross-bridges
During muscle contractions,
The myofilaments shorten
The actin filaments move towards the middle of sarcomere
The actin and tropomyosin filamens slide over each other
Cross-bridges of myofilaments are formed permanently
Where are neurotransmitter receptors located?
On the nuclear membrane
At Nodes of Ranvier
On the presynaptic membrane
On the postsynaptic membrane
Steroid hormone-receptor complexes formed in
the lysosome
the plasma membrane
the cytoplasm
Which of the following is TRUE of a non-steroid hormone action mechanism?
Hormone binds with a specific receptor on the cell membrane
Hormone binds with the receptor in the cytoplasm
Hormone crosses the cell membrane
mRNA is produced
Muscle cells are stimulated by neurotransmitters released from the synaptic terminal of
Motor neuron axons
T tubules
Sensory neuron axons
Motor neuron dendrites
In order to flower, a short-day plant needs a
night that is longer than a certain length
day that is longer than a certain length
lash of red light during a long dark period
high level of Pfr
