Exam 2: Cell Physiology

During the relative refractory period, a neuron is completely refractory.

Which of the following organelles is NOT membrane bound?

The signal-recognition protein recognizes both the ____________________ on the ribosome and the ____________________ on the ER, then delivers the proper ribosome to the proper site on the rough ER for binding.

Match the terms, labelled a. through d., to their descriptions. (Options may be used more than once or not at all.) a.microtubules b.microfilaments c.intermediate filaments d.micro trabecular lattice -smallest element visible with a conventional electron microscope

The myelin on a myelinated fibre in the peripheral nervous system consists of Schwann cells wrapped around the axon.

Match the terms, labelled a. through c., with their characteristics, labelled 1. (Options may be used more than once or not at all.) a.glycolysis b.citric acid cycle c.oxidative phosphorylation -does not directly use inspired oxygen

Match the result, labelled a. or b., with the force and involved ion in question. (Options may be used more than once or not at all.) a.The ion tends to be moved into the cell by this force. b.The ion tends to be moved out of the cell by this force. -electrical gradient for Na⁺ at resting potential

Neurotransmitters are small, ____________________acting molecules.

Foreign material to be attacked by lysosomal enzymes is brought into the cell by the process of ____________________.

Myelinated fibres in both the central and the peripheral nervous systems are capable of regenerating when cut.

Match the terms, labelled a. through i., to their descriptions. (Options may be used more than once or not at all.) a.endoplasmic reticulum (ER) b.Golgi complex c.lysosome d.peroxisome e.mitochondrion f.vault g.free ribosome h.microtubule i.microfilament -the powerhouse of the cell

ATP synthase is located in the inner mitochondrial membrane.

Match the cellular proteins, labelled a. through e., with their correct characteristic. a.dynamin b.tubulin c.kinesin d.actin e.ribophorin -comprises intermediate filaments

The protective, waterproof outer layer of skin is formed by the tough skeleton of the microtrabecular lattice that persists after the surface skin cells die.

____________________ are cave-like indentations on the outer surface of the plasma membrane.

Match the ions, labelled a. through d., with their various roles. (Options may be used more than once or not at all.) a.Na⁺ b.K⁺ c.A^- d.Cl^- -cation to which the membrane is most permeable under resting conditions

Match the terms, labelled a. through c., to their descriptions. (Options may be used more than once or not at all.) a.flagella b.cilia c.microvilli -guide egg to oviduct

Which of these statements correctly describes the resting membrane potential?

Match the ions, labelled a. through d., with their various roles. (Options may be used more than once or not at all.) a.Na⁺ b.K⁺ c.A^- d.Cl^- -ion whose equilibrium potential is greater than the resting membrane potential

When EPSPs occurring simultaneously from two different presynaptic inputs add together or sum to bring the postsynaptic cell to threshold, it is called ____________________.