1 Curare is a poisonous plant extract Curare molecules have a chemical structure like the neurotransmitter ACh Curare can bind to the ACh receptor site on the chemically gated ion channels in the motor end plate Even though curare will bind to the receptor site it will not open the ion channel and no ions will pass through What do you think the symptoms of curare poisoning would look like A Muscles will respond too uickly and cause a severe tremor B Curare will only affect cardiac muscle causing fibrillations of the heart C Curare will only affect muscles with ACh receptors paralyzing them D Smooth muscles will become stimulated causing quick movement of nutrients through the digestive system 2 Addition of more mitochondria to a muscle fiber will have the least effect on A slow oxidative fibers B fast glycolytic fibers C both slow and fast oxidative fibers D fast oxidative fibers 3 The thin filaments are not comprised of which of the following components A Actin B Titin Troponin Tropomyosin C D 4 At the neuromuscular junction the muscle contraction initiation event is A a release of calcium ions from the sarcoplasmic reticulum B conduction of an electrical impulse down the T tubules C binding of acetylcholine to membrane receptors on the sarcolemma D sliding of actin and myosin filaments past each other