IB Neural Signaling

During repolarization of nerve –

• K⁺ gate closes and Na⁺ gate opens

• Na⁺ channels are closed and K⁺ channels are opened

• Both K⁺ and Na⁺ gates are closed

• Both gates remain opened

Tags

NGSS.HS-LS1-3

The junction between the axon of one neuron and the dendrite of the next is called –

• A joint

• Constant bridge

• Junction point

• Synapse

Five events in the transmission of nerve impulse across the synapse –
A. Opening of specific ion channels allows the entry of ions, a new action potential is generated in the post-synaptic neuron.
B. Neurotransmitter binds to the receptor on post synaptic membrane
C. Synaptic vesicle fuses with pre-synaptic membrane, neurotransmitter releases into synaptic cleft.
D. Depolarization of pre-synaptic membrane
E. Arrival of action potential at axon terminal.
In which sequence do these events occur?

The new potential developed on post-synaptic membrane is –

• Always excitatory

• Always inhibitory

• May be excitatory or inhibitory

• Neither excitatory nor inhibitory

The hind brain develops into which structure?

• Medulla

• Pons

• Cerebellum

• All

The forebrain develops into –

• Diencephalon and Cerebrum

• Diencephalon and Cerebellum

• Diencephalon and Medulla

• Diencephalon and Pons

The thalamus and hypothalamus develop from –

• Telencephalon

• Diencephalon

• Cerebrum

• Cerebellum

The correct sequence meninges from inner to outerside is –

The name of nervous band connecting the cerebral hemispheres is –

• Corpus albicans

• Corpus callosum

• Corpus striatum

• Corpus spongiosum

Myelinated fibres of the tract forms –

• White matter

• Grey matter

• White and grey matter

• Red matter