امتحان لايف Biology ||| Chapter 1+2 – [Motor Unit+ Muscle fatigue +Pituitary gland ]

The following diagram represents the contraction of some body muscles, examine it then answer the following:

Which curve(s) represents weak muscle contraction?

Which curve(s) represents strong muscle contraction?

Which curve(s) represents strong muscle contraction but not followed by muscle relaxation?

The occurrence of the muscle spasm is due to…………………….

The occurrence of muscle fatigue is due to…………….

if a muscle contains 6 muscle bundles, each bundle contains 20 muscle fiber what is no. of [motor units-no. of motor nerve fiber -no of neuromuscular junctions- and terminal branches]?

Motor unit = …………….

If a muscle contains 6 muscle bundles, each bundle contains 20 muscle fiber what is no. of [motor units-no. of motor nerve fiber -no of neuromuscular junctions- and terminal branches]?

Motor nerve fiber = ……………….

If a muscle contains 6 muscle bundles, each bundle contains 20 muscle fiber what is no. of [motor units-no. of motor nerve fiber -no of neuromuscular junctions- and terminal branches]?

No. of neuromuscular junctions=………………….

If a muscle contains 6 muscle bundles, each bundle contains 20 muscle fiber what is no. of [motor units-no. of motor nerve fiber -no of neuromuscular junctions- and terminal branches]?

No. of terminal branches =…………………….

the maximum no. of motor units produced by 100 muscle fiber is……………………

The least no. of motor units produced by 300 muscle fiber is……………………

The maximum no. of the motor end plates in the motor unit is ………….

The glandular part of the pituitary gland consists of………… 

The endocrine glands secrete hormones and supplied with dense network of blood capillaries

The hormone responsible for the releasing of milk from the mammary glands as a response to the beginning of lactation is secreted from ……………..

Oxytocin is …………………..

Disease resulted from the hypersecretion of growth hormone in the adult is………………

…………..(is)are secreted from the growing tips in the plants and affect the growth regions

Absence of …………………. hormone in Human male stops the formation of sperms.

-………………….is a neural hormone.

One of the competitors is training for a marathon. He doesn’t drink enough water to replace the water he loses as sweat . This has an effect on his body as the following :

Name hormone (A)is……………..

What effect will hormone (A) have on the kidneys ?……………….

How will this affect the urine formation ? …………………..