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Human Biology

SKIN REPAIR Homeostatic Nature

Can you explain to me the homeostatic nature of skin repair and how stress or poor nutrition affect the skin's ability to heal a wound?

Blood Test Results

Subject A is 19 year old student, 1.72 m tall and weighs 53kg. Subject A has been suffering from severe diarrhoea, stomach cramps, flatulence, bloating and stomach pain. He has been suffering from tiredness and generally feeling run down. Subject A is non drinker, non smoker, often skips breakfast but always has cooked m

Concept map on metabolism

Create a concept map using the below words. Provide a summary of your map, including how the words are related to each other and the overall concept. Hexokinase Glucose Glycolysis Krebs cycle Electron Transport Chain Pyruvic acid Acetyl - CoA Fermentation Lactic acid Ethanol Cytochrome oxidase ATP NADH


Describe the basis and uses of biofeedback training.

ANS fibers

Which ANS fibers release acetylcholine? Which release norepinephrine?

Sympathetic activation

Indicate the results of sympathetic activation of the following structures: sweat glands, eye pupils, adrenal medulla, heart, lungs, liver, blood vessels of vigorously working skeletal muscles, blood vessels of digestive viscera, salivary glands. Which of the effects would be reversed by parasympathetic activity?

Animal Behavior - Reproductive strategies

Outline the theoretical basis for the typical female reproductive strategy. Outline the theoretical basis for the typical male reproductive strategy Sometimes the typical reproductive strategy is reversed. Give an example. Include what is usually different about the reproductive process in those species that results in thi

Cerebrospinal Fluid

(a) How is cerebrospinal fluid formed and drained? Describe its pathway within and around the brain. (b) What happens if CSF is not drained properly? Why is this consequence more harmful in adults?

MIC Calculation & Dilution series

The MIC of penicillin for Staphylococcus epidermis was determined to be in tube #5. The starting concentration was 1000g/ml in tube #1 and a 5-fold dilution was performed. What is the MIC? Show how you would do the dilution series?

Determining Neuronal Activity

Since at any moment a neuron is likely to have thousands of neurons releasing neurotransmitters at its surface, how is neuronal activity (to fire or not to fire) determined?


Please answer the following: (a) Explain the difference between an EPSP and an IPSP. (b) What specifically determines whether an EPSP or IPSP will be generated at the postsynaptic membrane?

Action Potential Generation

This job describes the events that must occur to generate an action potential (AP). It then relates the sequence of changes in permeability to changes in the ion channels and explains why the AP is an all-or-none phenomenon.

Concentration of the Protein in the Serum

2.00 mL serum sample is analyzed for protein by the modified Kjeldahl method. The sample is digested, the ammonia is distilled into boric acid solution, and 15.0 mL of standard HCl is required for titration of the ammonium borate. The HCl is standardized by treating 0.330g pure (NH3)2SO4 in the same manner. If 33.3 mL acid is re

Calculate osmolar clearance and free water clearance

A 35-year-old female complains to her doctor that she is suffering from frequent urination. Her resting blood pressure and heart rate are 120/80 and 72, respectively. Her plasma creatinine is 0.85 mg/dl, urine flow is 5 ml/min, and urine osmolarity is 190 mOsm/l. Her plasma osmolarity is 290 mOsm/l. Calculate her osmolar clea

MHC uniqueness of individuals

Find the correct answer: The uniqueness of an individual is defined in part by the a. Type of antibodies produced by that individual b. Antigens to which the individual can respond c. Ability to produce T cells after passage through the thymus d. MHC proteins on the surfaces of the individual's cells.

Integumentary homeostasis

You go to the beach to swim on an extremely hot, sunny summer afternoon. This job describes two ways in which your integumentary system acts to preserve homeostasis during your outing.

Neurobiology questions

1. Two types of GABA receptors have been identified. The GABA(a) receptor is an ion channel permeable to CL-; and the GABA(b) receptor is a G-protein-couple receptor (activates a second messenger cascadein the postsynaptic cell) which causes K+ selective channels to open. What effect would the activation of GABA(b) receptors hav

Volume & Concentration Problem is asssessed.

I have 100mls of an antibiotic stock solution at a concentration of 6mg/ml. I would like a final volume of 10mls of the antibiotic at a concentration of 1.5mg/ml. How much of the stock solution do I need to obtain this?

Serial Dilutions are explained.

You are given a milk sample that Mr. Milkman claims contains 3.8 x 10^8 CFU/ml. He claims this is within the limit of acceptable CFU/ml for Grade A milk. Diagram a procedure he could use to determine the CFU/ml and information pertinent to proving or disproving Mr. Milkman's claim. Is the milk within the acceptable limit?

Auditory System

Consider two hearing-impaired persons. One is deaf in the left ear but has normal hearing in the right ear. The second cannot hear frequencies above 1 kHz in either ear, but has normal hearing in both ears for lower frequencies. What problems would these two persons have with such everyday auditory tasks as localizing sound in s

Dilution Series for Liquid Culture of Staphylococcus Aureus

If you had a liquid culture of Staphylococcus aureus and transferred 2ml to test tube "R", which contains 8ml of nutrient broth, what would be the final dilution (in simplest terms) of the culture in test tube "R"? From the culture in "R" make a 1:15 dilution in tube "S". What is the final dilution of the culture in tube "S"?

Dilution Series

I am looking for a detailed solution and explanation. I give you 10mls of an overnight culture of Micrococcus luteus at a concentration of 4.7 x 10^7 CFU/ml. Diagram a dilution series by using tubes containing 9ml nutrient broth (NB) and fixed-volume 1ml pipettes (won't measure any more or less than 1ml).

Dilution Series

Perform a 2-fold serial dilution using 4 tubes containing 1ml of NB each and a 20ml broth culture of Bacillus subtilis; use the same B. subtilis culture and perform a 2-fold serial dilution using 4 tubes containing 2ml of NB each; repeat in a similar fashion using 4 tubes containing 0.5ml each.