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【多选题】
吊顶主要有三个部分组成，即 、 和 。A.
吊筋
B.
骨架
C.
面层
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举一反三
【单选题】Of the events that lead to myofilaments sliding over each other, which of the following happens first in skeletal muscle?
A.
The myosin head engages with the binding site on actin
B.
Troponin changes shape and pulls on tropomyosin
C.
Calcium ions enter the cell cytoplasm
D.
ATP is hydrolysed to ADP and inorganic phosphate
【单选题】建设工程总投资，一般指进行某项工程建设花费的全部费用。生产性建设工程总投资包括建设投资和( )部分，非生产性建设工程投资只包括建设投资。
A.
铺底流动资金
B.
预备费费用
C.
无形资产
D.
有形资产
【单选题】The muscle cell is an elongated cell, which is commonly called a muscle fiber.
A.
skeletal … mononucleate
B.
skeletal … multinucleate
C.
cardiac … multinucleate
D.
cardiac … mononucleate
【多选题】翻译:A.epithelial tissue ; B.nervous tissue;nervecell; neuron; neuroglial cell; nerve fiber C.muscle tissue; skeletal muscle; cardiac muscle; smooth muscle D. loose connective tissue; dense connect...
A.
上皮组织
B.
神经组织；神经细胞；神经元；神经胶质细胞；神经纤维
C.
肌组织；骨骼肌、心肌、平滑肌
D.
疏松结缔组织；致密结缔组织
E.
软骨组织; 骨组织
【单选题】Which ion below is supposed to trigger the contraction of the skeletal muscle cell ( )
A.
Na+
B.
K+
C.
Ca2+
D.
Cl-
E.
Mg2+
【单选题】With the transmission electron microscope skeletal muscle fibers can be seen to contain structures called triads. What do the two lat- eral components of a triad represent?
A.
Attachment sites for thick myofilaments
B.
Sites for calcium sequestration and release
C.
Sites for impulse conduction into the fiber
D.
Sites for ATP production
E.
Sites for synthesis of proteins to be secreted outside the cell
【单选题】The main difference between ventricular myocyte action potentials and skeletal muscle cell action potentials is
A.
Fast depolarization
B.
Large amplitude
C.
There is a platform period
D.
Short repolarization time
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