Z3215682

Lab 1 Questions

1. What is the protein that the sperm binds to on the surface?

ZP3 protein

2. Name the 3 stages of follicle development in the ovary?

1-Primordial follicle 2-Preantral follicle 3-Antral follicle

--Carly Mooney 13:10, 6 August 2009 (EST)

Lab 2 Questions

1. What factor do the synctiotrophoblast cells secrete to support the ongoing pregnancy?

hCG – Human Chorionic Gonadotropin

2. What does the corpus luteum secrete to prevent continuation of the menstrual cycle?

oestrogen and progesterone

3. What are the 2 main tissues to be derived from the germ cell layer continuous with the lining of the amniotic sac?

Epidermis epithelium Nervous tissue

--Carly Mooney 13:15, 13 August 2009 (EST)

Lab 3 Questions

1. What period of human development (in weeks) do the 23 Carnegie stages cover?

Week 8

2. What part of the somite will contribute to the vertebral column?

Cells differentiate to form sclerotome, which forms ventral column

3. At what Carnegie stage does the human neural tube normally completely close?

By stage 13 the neural tube is completely closed

--Carly Mooney 13:08, 20 August 2009 (EST)

Lab 4 Questions

1. Into what structure do most blood vessels empty before they enter the embryonic heart?

Sinus Venosus

2. What do the dorsal aortas become in the adult?

descending aorta

3. What are the layers of cells found in a tertiary villi?

mesenchyme differentiates into blood vessels and cells, forms arteriocapillary network, fuse with placental vessels, developing in connecting stalk

--Carly Mooney 13:13, 27 August 2009 (EST)

Lab 5 Questions

1. What was the question I said in the respiratory lecture would be part of this week's assessment?

Is the Congenital Disphramatic Hernia more common on one side or both?

2. What is the answer to the above question?

Yes it is more common for the hernia to happen on one side than the other resulting in the viscera entering the thorax and compressing the lung.

--Carly Mooney 13:59, 3 September 2009 (EST)

1. Which is the more common clefting, cleft lip or cleft palate?

cleft lip

2. What structures does pharyngeal pouch 1 form?

Pharyngeal pouch 1 elongates to form tubotympanic recess, tympanic cavity, mastoid antrum, eustachian tube

3. Neural crest forms which cells within the skin

melanocytes (skin)

--Carly Mooney 13:12, 17 September 2009 (EST)

1. Briefly; what is a myotube and how is it formed?

Myoblasts are single cells that differentiate to form myotube. The myotube is multiple nuclei all bound by a single membrane a developing muscle cell or fiber with a centrally-located nucleus. Thus, the myotubes must have been formed from the fusion of numerous myoblasts

2. What changes would I expect to see in the muscle fibre types in my legs if I:

a) Suffered a spinal cord injury

Atrophy: Reduction of slow fibres (type I) and conversion to fast twitch fibres (type II)

b) Took up marathon running

Muscles would conversion from fast twitch(type II) to slow twitch fibres(type 1)

--Carly Mooney 13:11, 24 September 2009 (EST)