1. Indicate which of the following best illustrates the concept of positive feedback? The concept of negative feedback? Make sure to justify your answer.

1. An increase in the concentration of H+ in blood causes an increase in H+ excretion in the urine.

2. An increase in the carbon dioxide concentration of the blood stimulates breathing, which increases the rate at which carbon dioxide is eliminated from the body.

3. Contractions of the uterus push the fetus against the cervix, which triggers release of oxytocin into the bloodstream. Oxytocin then stimulates stronger contractions of the uterus.

A) How would the development of the testes in a chromosomally XY rat embryo be affected by exposure to very high levels of estradiol?

Select one:

a. It would develop ovotestes, gonads that consist of a combination of testicular and ovarian tissues

b. It would develop testes

c. Gonadal development would be stopped

B) You treat a chromosomally XY rat fetus early in development with a combination of an androgen receptor antagonist and an MIS receptor antagonist. What internal reproductive organs would it develop? Check all the correct answers.

a. Fallopian tubes

b. Ovaries

c. Testes

d. Uterus

e. Seminal vesicles

f. Cervix

g. Seminal vesicles

h. Vas deferens

C) What internal reproductive organs would develop in a female rat pup (chromosomally XX) if you treated her with MIS during early embryonic development? Check all the correct answers.

Select one or more:

a. Vas deferens

b. Ovaries

c. Epididymis

d. Cervix

e. Uterus

D) Development of which of the following tissues in an embryo is affected by DHT levels? Check all the correct options.

a. Genital tubercle

b. Mullerian ducts

c. Gonads

d. Wolffian ducts

e. labioscrotal swellings

BJ. is a 5-year-old boy who has suffered from repeated upper respiratory infections since he was 16 months old. At 4 years of age, he was diagnosed with allergic asthma. The following winter, at age 5, he was admitted to the hospital twice for acute asthma with a secondary bacterial pulmonary infection.

At the second admission, a complete blood count, sputum culture, and immune status work-up were ordered.

Laboratory Data

Assay                                        Patient Results          Reference Range

Hemoglobin                                13.5 g/dL              11.5-14.5 g/dL

Hematocrit                                    40% 33-43%

Total WBC count 16.2 x 10⁹/L          4-12 x 10⁹/L

Lymphocyte Count 4.3 x 10⁹/L             2.7-5.4

T lymphocytes                             2.4 x 10⁹/L             2.7-5.3

B lymphocytes                              1.0 x 10⁹/L            0.6-1.4

1. What is the etiology of this patient’s recurring infections? Explain your answer.

What characteristics define cardiac muscle when compared to other types of muscle (like smooth and skeletal)? in terms of size, arrangement, appearance.

What is your assessment of a patient acid-base status that has the following ABG values?

pH = 7.3

pCO2 = 40mmHg

HCO3 = 20 meq/L

Please describe the patellar reflex and state what the stimulus, receptor, and effector organ(s) are in this reflex.

When Dissecting a cow eye

Choose two structures that you observed in your dissection. Describe each structure that you choose and summarize its function.

Three primary layers are responsible for the majority of eye function. Please summarize the layers and the structures located in each layer.

Need Explanation

1-Pick an epithelial tissue and connective tissue. Compare and Contrast. Where would you expect to find each and why?Need Explanation

2-Compare and contrast all 4 general tissue types?Need Explanation

Starting with the external ear moving inward, summarize the three divisions of the ear and list the structures located in each division.

  Place the glands that produce semen in their correct order with the % of semen that the produce