Crowdly

At which stage of sperm maturation does capacitation take place?

Following exposure to enzymes secreted by the uterine wall

During transit through the epididymis

During spermatogenesi

During colonisation of the gonad

Following exposure to the seminal fluid produced by the prostate

Cells invaginating through the primitive streak during gastrulation give rise to what?

Mesoderm

Ectoderm

Endoderm

What does “nodal flow” do?

directs the formation of the anterior-posterior axis of the embryo by controlling the flow of growth factors

directs the left-right axis through directing growth factors to one side of the embryo

controls the development of the dorsal half of the embryo

Match the three germ layers to a cell type that is derived from that layer.

endoderm

ectoderm

mesoderm

What is the correct order of events in early embryogenesis? (from 1 = earliest to 5 = latest, put the following into the correct order)

morula

foetus

4 cell embryo

fertilised egg

blastocyst

The speed of electrotonic current

Is faster in small diameter neurons

Is faster in large diameter neurons

Varies proportionally with neuron axon diameter

Varies inversely with neuron axon diameter

Is independent of the axon diameter

Which of the following statements is TRUE?

Myelination allows significant leakage of ions along the neuron

Decreasing axon diameter slows the speed of action potential propagation

Myelin totally prevents current leakage along a neuron

Increasing axon diameter slows the speed of action potential propagation

Myelinated neurons do not need to produce action potentials to boost the current

Electrotonic current flow along an axon is the term to describe

The way in which voltage-gated Na⁺ ion channels recover after a refractory period.

The way in which APs appear to skip from one node of Ranvier to the next

The regeneration of APs along the length of an axon

The unidirectional flow of current down the electrical gradient along an axon

The passive flow of current down an electrical gradient along the axon

is myelinated by Schwann cells.

The terminal of a neuron

allows the AP to travel back along the neuron.

is able to produce an AP if it is depolarized to threshold.

is myelinated in neurons with myelinated axons but not in neurons with unmyelinated axons.

is depolarized by current spread from the last point of the axon which can produce an AP.