Content- Part 2 Flashcards
What is water’s role in biology?
Water content helps to maintain a cells morphology
The molecules that dissolve in water must be what:
1- The molecules must be hydrophilic
2- The molecules that dissolve must be polar themselves
What is the size of some somas?
5-140 micrometres
What are CNS grey and white matter?
A form of tissue arrangement.
White matter contains myelinated nerve fibres
Grey matter is the central region of the spinal cord
What cell types provides the myelin sheath of axons in the PNS and CNS respectively?
PNS = Schwann cells CNS = Oligodendrocytes
What glia cell type helps maintain the blood brain barrier?
Astrocytes
Which glial cells line the cerebral ventricles and why?
Ependymal cell because this forms a continuous epithelial sheet
What is the function of microglia?
Plays a role in CNS injury/inflammation
What is coactivation?
Simultaneous activity of agonist and antagonist muscles
What is the latent period?
Interval between the stimulus and the beginning of contraction
What disease could slow down nerve conduction?
Peripheral nerve injury
Why is there a lot of adipose tissue around the eye?
So that it can act as a protective cushion
What does the ora serrata represent and why does it have this name?
The ora serrata represents the transition region.
It has this name because it has a serrated appearance
What type of tissue is the vitreous humour an example of?
Connective tissue
What is the function of the vitreous humour?
Provides support for the eyeball, plus additional refractive power
The retina is involved in the “transduction” of the visual stimulus. What does this mean?
It converts the optical image into nervous potentials
What is the function of a tapetum?
Assists with vision at night time
Why is the tapetum sometimes unevenly distributed?
Because for some mammals, they only need to reflect light coming from below for food purposes.
How is the lens attached to the ciliary body?
By zonules
Which lens is more curved?
Posterior
What feature distinguishes the pars plana and pars pilcata?
The pars plana is smoother and thinner
What are the two main functions of the ciliary body?
1- Produces aqueous humour
2- Contains the ciliary muscle which allows for accommodation
What is the limbus?
The corneoscleral junction
What is drained at the filtration angle?
Aqueous
What pathological condition results from inadequate drainage?
Glaucoma
What is the function of the ciliary body epithelium?
Produces the aqueous humour
What is the function of the iris epithelium?
Controls the entry of light into the eye
