Effect of repeated immobilization on musculoskeletal system and parathyroid hormone in male albino rats

In this study, 40 adult male albino rats were used to investigate the effect of repeated immobilization stress on the musculoskeletal system and parathyroid hormone. The rats were divided into two equal groups [control and experimental]. The rats of the control group were kept in the housing cages, while those of the experimental group were put singly in cages 10 x 5 x 5 cm for six hours daily, then returned to the housing cages. This procedure was continued for 15 days. At the end of the experiment, blood was taken to estimate serum calcium, phosphorus, alkaline phosphatase and parathyroid hormone. Specimens from skeletal muscles, long bones and joints were taken for a histological examination

Age-related response to noise stress on gastric secretion and ulceration in male albino rats

The effects of noise on gastric secretion and ulceration in male albino rats were investigated. Forty-eight rats were used and divided into three main groups i.e. young, adult and senile. Each group was subdivided into control and experimental subgroups. The experimental animals were exposed to noise stress [100 dB] one hour daily for four weeks. The results showed that noise decreased the volume and total acid output in all animal groups and increased the titratable acidity in young group. Noise increased the ulcer index in adult and senile groups and led to vascular congestion, inflammatory cell infiltration, glandular deformity, mucosal atrophy and musculosa hypertrophy in the stomach of all groups

Effect of unsatisfied sexual excitation on reproductive system in male albino rats

Sixty adult albino rats [20 males and 40 females] were used to study the effect of sexual excitation on the male genital system. Rats were divided into two equal groups i.e. control and experimental. Rats were exposed to continuous sexual excitation for one month. Hormonal studies showed imbalance in the pituitary gonadotrophic and corticotrophic hormones as well as testosterone and cortisol. Histological studies showed severe affection of the secretory sex organs [testes, seminal vesicles and prostate] with no significant affection of the penis and vas deference