Based on this map, which of the following
countries do you think contributes most to
global climate change?
CARBON DIOXIDE EMISSIONS
and
Sreenland
Russia
Russia
Canada
In thousands of
metric tons
5.000.000
1,000,000-5,000,000
300.000-1.000.000
100.000 300,000
50.000-100,000
20,000-50.000
5,000-20,000
1,000 5,000
0-1.000
USA 2
China
Africa
Mexico
India
Brazil
South Africa
O A. South Africa
O B. Russia
O C. Greenland
O D. China

Choose the incorrect statement (a) the motor end plate membrane is only capable of generating graded potentials, but it is contiguous with the skeletal muscle sarcolemma, which can generate action potentials. (b) propagation of an action potential through the t-tubules into the sarcoplasmic reticulum triggers the release of ca++ into the cytoplasm of a skeletal muscle fiber. (c) the generation of suprathreshold endplate potentials in multiple muscle fibers could be due to the increased frequency of action potential generation at the axon hillock of a single motor neuron. (d) a greater amount of ach would be found in the presynaptic vesicles of a motor unit that fired several action potentials after exposure to botulinum toxin, than in a motor unit that fired several action potentials after exposure to the venom of the krait snake (which contains α-bungarotoxin).