سہارا، حرکت اور ہوموسٹیسز

Written by Dr. Hira Salman (Biology)

ایم ڈی کیٹ · حیاتیات · 8 سوالات

نام: ____________________ تاریخ: ____________

Which tissue joins one bone to another bone?
- A Tendon
- B Cartilage
- C Muscle
- D Ligament
Which protein forms the thin filaments of a muscle fibre?
- A Collagen
- B Keratin
- C Actin
- D Myosin
Which neurotransmitter is released at the neuromuscular junction?
- A Adrenaline
- B Acetylcholine
- C Serotonin
- D Dopamine
Antidiuretic hormone (ADH) causes the collecting duct to:
- A Stop filtering blood
- B Reabsorb more water
- C Secrete more water
- D Reabsorb less sodium
Which part of the brain acts as the body's thermostat?
- A Cerebellum
- B Pons
- C Medulla
- D Hypothalamus
The knee is an example of which type of joint?
- A Pivot
- B Gliding
- C Hinge
- D Ball and socket
Muscle contraction needs ions of which element, released from the sarcoplasmic reticulum?
- A Potassium
- B Iron
- C Calcium
- D Sodium
Skeletal muscle fibres are:
- A Spindle-shaped and involuntary
- B Branched and striated
- C Multinucleate, striated and voluntary
- D Single-nucleus, smooth and involuntary

جوابی کلید

1. D, 2. C, 3. B, 4. B, 5. D, 6. C, 7. C, 8. C

Ligaments connect bone to bone. Tendons connect muscle to bone.
Thin filaments are made of actin and thick filaments are made of myosin.
Acetylcholine crosses the junction and makes the muscle fibre contract.
ADH makes the collecting duct more permeable to water, so more water returns to the blood and the urine is more concentrated.
The hypothalamus detects changes in blood temperature and starts responses such as sweating or shivering.
A hinge joint, like the knee or elbow, allows movement in one plane.
Calcium ions bind to troponin, which allows actin and myosin to interact.
Skeletal muscle fibres are long, have many nuclei, show stripes under the microscope and are under voluntary control.